If you aren't rooting, the the Nook Tablet is a horrible choice. It's stock configuration doesn't have the Google Play store, you are stuck with B&N's very limited app selection.
As Zerocool said, you can get a new Kindle Fire for around that price now. Amazon's Appstore is much larger.
But spending a bit more on a $200 Nexus 7 seems like a no brainer though. Maybe you can find some clearance 8GB Nexus 7s cheap this Monday if that's enough room for you.