I have real trouble getting into canon pairings because it's all on screen and no fun for me to write.
Spike/Angel was hinted but gives me plenty of scope to interpret anyway I like.
In BtVS the only one that interested me was Spike/Anya and I was disappointed they didn't do any more with it.
In AtS I would say the only one that seemed to have potential would be Wes/Lilah, for the same reasons as you have said.