I had been using the latest RC of CM7.2 for a long time. A few weeks ago I switched to RC2 of Incredible Jellybean (based off of CM10 I believe). I was pretty pleased with the speed and stability initially, but it does seem to be a bit laggy from time to time and I occasionally have to reboot to get GPS working properly with come apps. Overall, I've liked this ROM a lot, but I've been thinking of dropping back to CM7.2 until I finally decide which new phone I want to go with. CM7.2 was just solid and fast, can't really ask for more than that on a phone this old now! It's a tank!
I'd love to hear about some other fast and stable ROMs that folks are loving.
But yeah, I'm finally thinking about upgrading soon here. Somewhat torn between going with the Galaxy Nexus HSPA+ straight from Google or possibly the S3 or HTC One X from T-Mobile. I like some of the higher specs on the latter two, particularly the camera. I just think it's such a better deal to get the GNexus for $350 from Google and only paying $30 bucks a month on T-Mobiles pre-paid with unlimited data and text. That's just too good of a deal to pass up. Save me $HUNDREDS a year!