After playing a lot online in persistent worlds, I've seen the diversity of builds out there... and it made me realize how badly I have (so far) fared in my campaigns.

So... Can you guys recommend a small selection of builds that will work for the NWN single-player campaigns?

Both for NWN, SotU and HoU please? Rogue 17/Cleric 15/Fighter 8. You can go either Str or Dex based. For a good Str-based version, check out Mithdradates Harbinger of Chaos build; for a good Dex version, check out my Infernal Fencer build.

The nice thing about this build is that it's extremely versatile. It can set traps, cast spells, heal allies, and dish out a good amount of damage in melee. It also matures fairly quickly. There are no prestige classes, so you don't have to worry about meeting pre-reqs, although you do have to be a little careful not to get an XP penalty (you have to go Dwarven to avoid an XP penalty; take Rogue as your last level).

If you go Str-based you can get Dev. Crit., and if you go Dex-based you can get Epic Dodge. Throw in Improved Invis. for the 50% concealment and a lot of characters will have trouble hitting you. Wield a Scimitar and Shield (Rapier and Shield if Dex-based) for a good threat range and decent AC, or a Greatsword for a nice base damage. Personally I prefer the Scimitar; a 45% percent threat range with Dev. Crit. is just nasty.