Im a BA shipper but I dont read much BA fics these days, as for slash I tend to lean towards Spike/Angel, Spike/Xander, Angel/Xander. I dont really read femslash.
As for UC I tend to lean towards Spike/Faith.
If your into slash, I'd recomend
Jans Intentions Fics on LJ. Her writing is incredible and there is a lot of variation with ships. Mostly NC-17 work. I dont think its locked but some of it might be. Also a few Jossverse crossovers.
eta: forgot to add there is a lot QAF fics int hat list as well so just scroll down to the Buffy section.