I've had the nook color and the tablet and the fire. It really depends on what you want, if a ton of support and on board storage are things you want, and don't need the fastest thing ever, the color wins. Also cheaper then the other two. If you just want root but not custom roms and on board storage with more performance then a color, nook tablet. However at a little less you have the same or better performer with custom roms to pick from and don't mind losing onboard storage expansion, the fire wins.
As I said I have owned and hacked modded whatever all 3, for me its nook color or fire, forget the nook tablet for now. I sold my color to get the nook tablet, which I returned and got a fire. I've since moved on to an Acer iconia a100 and my mom uses the fire, rolling an ics rom and doing fine. I can't answer the wifi thing other then it connected to my wpa2 wifi fine for the 15 minutes before it got rooted and rommed. Still works with my wpa2, I've since changed from dlink to Linksys routers, never had an issue not due to a rom bug.
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My A100 Stuff:
Guide: All things Iconia A100
CM10 Unofficial Builds
My Droid DNA Stuff:
PAC-Man for the Droid DNA
Thank you to those that donated, it's greatly appreciated!