I second jcompton: I recommend two separate installs for BG2 and BG1. BG1 is best with EasyTutu and BG1 NPC project - other mods are welcome but optional. BG2 is great because there are hundreds of mods out there, but depending on what you want, I'd recommend this:
- Widescreen mod, BG2 Tweak Pack, Banter Pack and Level 1 NPC mod are my personal must-haves.
- if you want quest mods, it's Tower of Deception, Tales of the Deep Gardens, Quest Pack, Assassinations, Dungeon Crawl, Unfinished Business and other recommendations.
- if you like NPC interaction and flirting and friendships, it's NPC Flirt Pack, NPC IEP and Romantic Encounters.
- if you like romances, it's De'Arnise romance/Fade romance for guys, Kelsey/Kivan/Xan romance for girls, and for chatty NPCs with/without romances I'd say Keto, Kivan, Xan, Amber - and whatever else strikes your fancy. There are lots of NPCs, so take your pick. But NPC mods overload your override folder with sound files, increasing the risk of crashes, so I'd recommend not installing more than you'd need. Two or three is cool. And Crossmod Banter Pack, of course.
- as for "big mods" and "big installations"(mods over 100 mb, installations for over 20 mods), I'd recommend them for experienced users only, because troubleshooting is painful, especially for new users. Head to
this forum, if you want a big install.