iPad for Retina Display, but eliminated because of iTunes.
Playbook looks nice, but limited apps? How many do you need?
Windows for the same old reason (i.e. they all do the same thing, and it can be tedious jumping ship for someone trying to 're-invent the wheel' or control your shopping).
or:
Android, because hope springs eternal.
PS-I'm not going to do a lot of entertainment shopping with any one of them (it'll be free internet radio, Netflix streaming, and a few 'art' apps for me, on top of email and general surfing).
I do desire two cameras and HDMI port.