I have the kindle DX which is great, but unnecessary. I bought it before I got my iphone. Had I known I was due for a smartphone upgrade, I wouldn't have bothered with the 3G kindle. Anyway, I find I read using the kindle app on my iphone a LOT. I actually use it it more than I do my kindle because I always have my phone with me and sometimes, I just don't want to carry the kindle. I shrunk the text so more fits on each screen, so even for a fast reader, it's not nearly the problem I thought it would be.

I don't know anything about those off-brand tablets, but typically, you do get what you pay for in electronics. As an employee of a company that makes parts for all the major brands of tablets, personally I'd rather see you buy one of those.