AT&T - 2 lines, non-smartphone (no data plan), only one line w/$5 texting option - $90. We share 700 minutes but have TONS leftover - we probably have 4,000 rollover minutes right now.
Update: DH and I now have iPhones and we're under a discount from his company, so we're paying about $120/mo. That's for 2 iPhones w/2GB data plans each, 700 minutes, one line w/$5 texting. Not doing unlimited messaging b/c DH hardly texts and when he does it's just to me, and thanks to iMessage it doesn't count as a text message.
$150+ 2 lines. first line has unlimited internet (i couldn't give this up somehow i still have like international texting i think on this one shhhhh don't tell) 2nd line has unlimited text and the $20 plan for 2gb.
$35/month for 300 minutes and unlimited text and data - Virgin Mobile. Have had an Android phone for a year now, would like to switch to the iPhone, but paying full price for it is a bit off-putting, although you really do save quite a bit of $ over the long haul, say the course of a usual two year contract with another carrier. I have payments come out of my cc automatically, so that's easy. Coverage is on the Sprint network and it's worked fabulously for me. Very happy with VM!