Rules to follow if you're a combat rogue.
1: Two. Weapon. Fighting. Preferably with Kusari-Gamas. Except:
2: Invisible Blade's nice for 1 on 1 fights. Free sneak attacks every round.
3: If you don't want the Special abilities, Prestige early and often, take Daring outlaw and such.
Invisible Blade is probably the best combat fighter Rogue prestige class, so take that. You could combine it with daring outlaw and have a higher BAB if you can deal with losing the special abilities, so a solid build would be
Rogue 3/Swashbuckler4/Invisible Blade3. I have no idea what the qualifications are and whether or not you meet them. I don't really care. If you took improved TWF at 9th level (earliest), you have 4 attacks, each of which should do 5d6 of sneak attack, for a max of 20d6 per round. If you can sneak attack, that is. That's pretty good.