Sorry to hear about your experience craptcha. Hopefully your device issues are remedied quickly.
I received the 16g version last week, and absolutely love my Nexus 7. There were a couple of software upgrades since I received. The UI responsiveness is amazing, and is nice to hold. My one negative comment would be about the lack of headphones. Not sure if tablets in general include a headset.
Would be great to find out your favorite apps for Nexus 7. Any suggestions?