To be frank, I never liked much of the kits offered in BG/BG2 and I think dual classing is cheesy. I never liked how simplistic fighters/paladins were, I do like arcane and divine casters but given that I take Viconia the divine caster slot is filled and I want to try something new. So are there any REALLY good kit packs out there that are compatible with Baldur's Gate Trilogy?

There are many really good kit packs out there, you can find them at the major modding communities:

Gibberlings3

Pocket Plane Group

Spellhold Studios

I personally prefer the ones made by Andyr (he is a king of mods), I think they can be found in the BG2 TweakPack (although I think the two in there were originally intend by the game).

The Darkest Day MegaMod for BG2 adds loads of kits so you might want to look over there.

Edit: I probably should also include that the biggest kit packs are the ones available at Gibberlings 3 and they are Sword and Fist, Song and Silence and Divine Remix. The latter contains revamped divine spell system as well.