Haven't tried BGT, so can't comment on that.
Human Shield said:
Are NPCs effected if you import your character from BG1 to BG2
No.
No, except for the pantaloons needed for the stupid Bioware easter egg in ToB.
Does Tutu import correctly with the added kits it has?
I'm quite sure it does.
Sword Coast Stratagems (will this be alright with lower XP? Any way to get AI with buffs?)
I haven't tried SCS but I suppose it should be balanced.
BG1 NPC Project, any good?
Haven't tried this one either. More dialogue doesn't hurt, I guess, but can't comment on whether it's any good.
G3 Tweaks, Oversight, Ease of Use, etc.
Note, that you can choose which components to install, so never use the "install [a]ll components" option. Some of the tweaks are nearly cosmetic changes but some streamline the game system quite a lot, so read the documentation and pick the ones that appeal.
If you're going to install
Ascension(recommended), install the "Tougher Sendai" component from Oversight to make her more in line with the other baddies. I think the "Aligment correction" component is mandatory if you're going to use
Virtue, a supposedly good RPG elements enchancing mod(which I'm yet to try). I'm personally not very keen on the new high level abilites. Shoryuken!
aVENGER's Rogue Rebalancing (what did this do?)
I've only heard of this. I think it's quite an old mod, so there's a risk it might conflict with the newer ones.
Is Bigg Tweak Pack recommended? It fixes imprisonment and petrification but it looks like it can mess up other areas. Is it already on the G3 Tweaks?
No idea. You shouldn't have to worry about the imprisonment/petrification bug, unless you're planning to slog through the romances (and you shouldn't, if you're a healthy person with a balanced emotional life
).
Unfinished Business, is this any good or recommended? BG1 Version, any good?
I think the BG1 version is not compatible with TuTu, so skip it. Haven't tried the BG2 version yet, but it's supposed to be good.
Major conflicts between mods can really break your game, so be careful with the order you install them. You should be able to find a good guide for that at the pocketplane.net forums.
- edit -
http://forums.pocketplane.net/index.php/topic,17556.0.html