Giles on my screen, even if it comes out in England first = good. I'd watch ASH juggle geese if he did it in character as Giles.
Spike? Eh. I kinda feel like we've seen all we really can out of him... except for the Angel/Spike relationship. I loved that dynamic in season 5 of AtS. I could stand to go a few more rounds with those boys. If he Shanshues, I think that would be a fun story to watch. I'd also watch anything and everything having to do with Spike and Dru, if they could get Juliet Landau back.
Mostly, though, I'm more excited about a show than a movie. Joss does TV shows much better than he does movies. I'm also more excited about a Ripper project than a Spike project because, like someone else said, Spike's been done to death (literally); we just barely scratched the surface of Ripper/Giles.