I am looking at a used NC, both on ebay and CL. Is there anything that I need to look for as far as firmware, changes that can't be updated with a download etc. I want to be able to run CM7 and have a tablet to also play movies and such on for the little guy. Are there any major difference than that and a wifi only tablet.. it looks to good to be true that I could get a decent wifi tablet for less than 250 bucks.