i would be very careful if im you. been there, done that, suffers. some MODs are not compatible with others and they will just crash in the middle of the game. i downloaded a few and most of them works. here are some of them which works properly.
(be sure to download/tob the tobfixpack first)
xpcap (this will remove the barrier that keep you from gaining more xp and leveling up after you reached the highest required in the game)
bg2 attacks
bg2 lvl 50
ashes of embers
thief stronghold expansion mod
forgotten wars item project (it works but there are some problems like when you have the ability (assasin) to use any item, two handed sword like the moonblade wont work.. it will crash)
in this order you wont have any problem at all.
after this ive downloaded dungeons be gone (strictly for gamers who played the game at least 50 times) its a very helpful mod i think.
then theres azenMOD (it didnt work with my game... but some says it works with them. i bet its another MOD combo)
edge of endeavour (a verrry creative work... but it crashes when you start the game... specially with other MODs installed)
http://forgottenwars.net
then of course the NPC mods, very helpful indeed. (downloadable at http;//www.michel.rpgtalk.com)
... but be very careful i say. don't blame me in the end
Legolas Greenleaf