The nook HD is also a very solid tablet. Actually, outranked Kindle Fire at CNET.
Both tablets are very similar but the nook does have a better display and miniSD slot. It's also using Chrome as it's primary browser which is nice if you use Chrome on your laptop as I do. I think either tablet would suffice considering your needs. I'm in the process of doing the exact same thing you are so I've done my research. I'm dumping iPad2 for Chromebook + nook.
I'm actually getting my nook tomorrow in Boston and will let you know how I like it if you want.
EDIT TO ADD: my iPad2 is on eBay for $200 and is in excellent condition. Has a Browns Skin-it, Apple smart cover, and Targus leather-bound sleeve included in price. Anyway, just throwing it out there for ya because it's in your price range and an awesome deal.