Yeah, that's a pretty good price. I'm currently paying $65 a month to T-Mobile for 500 minutes talk/unlimited text/5 gb data. I could get that down to $45 a month if i was willing to drop the data to 200 MB a month, or $40 if i was willing to drop the unlimited texting as well. However that's because i'm saving $20 a month since i got an unlocked phone. It's really worth it if you're still willing to stick to upgrading only every two years, but you've got to have the initial cash to get started.

It looks like AT&T is not the best place to be if you're a fan of Android, but i guess i'd already heard that. Apparently there's a bigger selection of phones at places like Best Buy, complete with the two year contract discount. I'm not sure why AT&T doesn't include them on their website. Looks like they've got the Nexus S currently (for $50) though not the Galaxy Nexus yet. I haven't done a lot of research on the Nexus S, so i don't know how it compares to the phones you've been looking at.

There's a story that AT&T should have an LTE version of the Galaxy Nexus soon, but who knows exactly when that will be.