It's a tough choice for me between Uncanny and Astonishing. While Astonishing has been awesome, and easy to catch up with, I'm really digging the current space story in Uncanny.
Astonishing gets my vote, but barely.
X-men. I love Carey, and I'm digging his attempt to use the D-list to tell a great story
Too early to say so far. None of them teams have been on a book long enough for me to really get an idea of things. I like all of the books except for probably Ultimate X-Men. That book has just been a mess from day 1 and I doubt anyone could fix it. Don't read the Wolverine titles. Going to start reading X-Factor after the current arc.
If I had to rank currently:
1. Astonishing
2. X-Men
3. New
4. Uncanny
5. New Excalibur
6. Exiles
I don't consider any to be below above average at the moment.
I also like what Carey is trying to do with X-Men, and I think it's working. I haven't been reading X-Factor or Excalibur, though I've heard some nice things about both titles. I've never really been too big on Excalibur, even when Kitty and Nightcrawler were on the team. I'll probably get into X-Factor next.