I'm a geek when it comes to technology. I have a 2nd generation Ipad, the new Nook Tablet and a 3G/wireless Samsung Galaxy Tab. I bought the first 2 new and the Tab used.
Which gives you the best bang for the buck?
The Samsung....hands down. A good used one is $200. The Nook Tablet is a great Netflix machine, but it costs money for everything you download, and unless you "android" it, there are great limitations to what is available.
The Ipad is useful, but it's pricey, whether new or used. I think they are too big...a smaller version is rumored to be coming out in 2012.