Thanks PhaedrusXY, Leram, Endarire and Anklebite for your input.
So... I've decided to go with a Combat Conjurer Wizard, because I'd like to start with a Lion Totem Barbarian lvl instead of starting with a Fighter lvl, and the two extra Fighter Feats from 5 lvls of Combat Wizard are really nice for that (especially when there is a tendency in our campaigns to almost never be able to do things like craft an item, or scribe a scroll - there will barely be time to scribe new spells into my wizard spellbook, I guess). And, more importantly, the DM allows that combination (sadly, not with Abrupt Jaunt, as he counts that as another Variant Wizard in itself). I looked at Enchantment once again and thought that if I'm missing 2 spell lvls towards spell progression, Necromancy would really be better to have than Enchantment, so I forbid myself Evocation and Enchantment. Evocation for the reason some of you quoted - the Warmage should be able to take care of the damage part of Evocation at least.
Arcane Strike is debateable, I guess. I intended to use it to finish off caster enemies as quickly as possible (using it combined with Power Attack for its attack bonus, and later combined with Abjurant Champion's Arcane Boost, and eventually Heedless Charge against hard-to-hit lower hitpoint enemies with a high mischief potential).
As for the divine caster, we already have a Favored Soul, and he is the other guy willing to do some helpful/utility spells, so there won't be a problem with the divine buffs.
So, I fiddled some with my feat chain, which I suspect to be far from optimum as well
though it really looked good at first. I'd be really grateful if you could tell me what's wrong there, in your opinion. The feat chain is based on my love for Power Attack (+ Leap Attack), Shock Trooper, and Combat Brute which I believe go well together. These feats should also go well with the possibilties to gain an Attack Bonus via Arcane Strike and Arcane Boost for use of Power Attack without a Charge. And with Pounce (combined with charge) - first in the way PhaedrusXY described (alter-self or polymorph), later also in my "human form". Leap Attack was a feat I could fit right in, seeing I would probably use Greater Mage Armor and Shield, and so I'll have no Armor Check Penalty on my Jump check.
Barbarian / Combat Conjurer (-Enchantment, Evocation)
Human Male Lion Totem Barbarian 1 / Combat Wizard: Conjurer 5 / Eldritch Knight 2 / Abjurant Champion 5 / Eldritch Knight 7
str 14
dex 12
con 17
int 15
wis 12
cha 13
level: Feats (I am mostly limited to the Completes, Unearthed Arcana and the different PHBs but the Favored Soul player has found he has the Tome of Battle book in his collection, so it will be allowed at last)
1: Improved Toughness, Combat Casting, Rage, Pounce
2: Power Attack
3: Practiced Spellcaster: Wizard
6: Quicken Spell, Improved Bull Rush
7: Improved Sunder
9: Arcane Strike, Abjurant Armor
10: Swift Abjuration
12: Arcane Boost, Master Arcanist, Shock Trooper
13: Martial Arcanist
15: Leap Attack
18: Combat Brute