I would honestly advise against applying the paragon template. We don't want to transform him into superman (which paragon template does)...
Paragon doesn't even come close to transforming him into Superman... if we assume this guy is, let's say a Warblade 15, and we start him with a generous 36pt buy, with Str 16 Dex 16 Con 16 Int 12 Wis 10 Cha 8, then we give him three level boosts to Str, that gives him final scores of Str 34 Dex 31 Con 31 Int 27 Wis 25 Cha 23, with a +4 weapon he'd have +56 to attack rolls, with a +4 adamantium breastplate he'd have AC 58 and DR 12/Epic and 60ft Speed, he'd have Fast Healing 20 and saves that don't really matter since he uses the Diamond Mind counters anyway. That's nowhere near Superman levels of anything, and in fact, seems to accurately portray Deathstroke's abilities. He's supposed to have the strength of 10 men, or something, and while Str 34 is a little high for that (max load 2800lbs) it's perfectly standard for high level D&D characters.
I guess we are doing this...
So I guess I threw out a name like Superman, so perhaps I was playing a little light in my description of what the paragon template does to an individual. I'm going to use
this resource to approximate Deathstoke's powers...
Intelligence: Apparently he is very, very smart. But we have no actual scale for intelligence in D&D, so we have to use some solid guessing here. It is easy, through a tome of clear thought, for Deathstroke to achieve an intelligence score of above 20. Comparatively a Solar has an intelligence of 23 (even most great wyrm dragons don't get above this), so let us assume that even the low 20s is
really smart. But this does seem to be a signature ability for Deathstroke, so there is a quick solution. The intellectual prodigy template from Dungeon Master's Guide 2 seems appropriate and easy in its scope!
Dexterity: He's pretty reflexive and can dodge projectiles. This honestly is pretty for the norm of a high level D&D characters. With Diamond Mind maneuvers handling reflexes and a high ac, we can simulate this without giving the guy a dexterity into the high 20s. If anything, a score of something akin to 20-22 might be just what we need.
Strength: "As strong as ten men," is a really vague statement with D&D. How do we even gauge what that means? If we go by carrying capacity and use a base 10 as an ordinary man it would look like a strength score of 27 is about right... But that is for carrying items, how accurate is that? The site continues to decribe him as being able to, "press lift at a minimum of 800 lbs," which gives us some hard numbers. The only problem is it doesn't describe his maximum... So lets assume it is a number past that but not crazy beyond it. A strength score of 25 can lift a maximum of 800 lbs so perhaps we take him up to around 26-27 for lifting? Let us perhaps use a comparative study using a giant (which I think is the 'strong monster' of D&D), specifically a Hill Giant. Hill Giant's are the weakest of their kind with a strength score of 25. Now, should Deathstroke being a strong as a Hill Giant? Honestly, I don't know??? I think a nice place to put him might be around 25-27...
Constitution: He's tough and can endure for a long time. Is he beyond the scope of all of humanity, it certainly doesn't say so... I think a constitution score of 20 is appropriate.
Wisdom: Nothing is listed regarding this, so we can actually treat him as a mortal. He has experience and is a battle hardy, but brash as well... He knows how to interpret a battlefield but that is more of his intelligence than any sort of wisdom. A humble score of 16 seems nice and simple.
Charisma: Nothing is once again listed so, much like wisdom, we can treat this at a more down-to-Earth score. He's a villain and looks cool, so he has some nice style. But he isn't based around charisma so a score like 16 fits well here...
So let us perhaps look at what I might do with a point-buy score of 32 (because that is the commonly accepted base...)
Str 16, Dex 14, Con 14, Int 15, Wis 9, Cha 9
Applying the intellectual prodigy template we can throw a nice +2 bonus onto intelligence
Str 16, Dex 14, Con 14, Int 17, Wis 9, Cha 9
Not particularly awesome, but then we get into that nice, ol' medical experiment (where WLB explodes!).
Using Silthilar Bones, Muscles & Tendons, we can upgrade the three physical scores by 2 points each.
Str 18, Dex 16, Con 16, Int 17, Wis 9, Cha 9
Using a manual of bodily health (+4), manual of gainful exercise (+5), a manual of quickness of action (+4), a tome of clear thought (+5), a tome of leadership & influence (+5) and a tome of understanding (+5) we apply all of these bonuses over a very long time.
Str 23, Dex 20, Con 20, Int 22, Wis 14, Cha 14
And finally through applying level-appropriate bonuses from 4th, 8th and 12th level we can put those into strength.
Str 26, Dex 20, Con 20, Int 22, Wis 14, Cha 14
So we end up with a really strong, agile, tough and smart dude, not a complete beast in every subject. The problem with applying the Paragon template is that it hyper-inflates stats and to a degree ruins the template. Is Deathstroke beyond Captain America? That is the prime question one should ask, is he beyond the paragon of humanity stat-wise? Don't go around wasting the Paragon template (which is rightly deserved for much mightier people stat-wise). After all, why would Deathstroke have Damage Reduction 10/epic and Spell Resistance (at all...).
So, there is the problem with apply such a template. You disrespect the limits and boundaries of the character through an effortless application of a far too powerful template.