I have heard nothing but good news about nexus, (I don't own one but develop for them so I yak with a bunch that has them).
acer is nice, I own an acer phone (rooted) and laptop, but if you want android be careful, there's a bit of a war going on with google and acer and not sure what the outcome will because of some software issues dealing with china. Although I always acer myself, and not sure if that's only for phones although if it's for phones it should be for tablets also, and the only one they advertise on their site is the liquid E.
But nexus has been the number one that i keep hearing about from quite a few folks and never heard a bad thing about it yet. Reasonably priced and runs good.
"Windows: the worst system for the most money, Linux: the best system for free"
Registered Linux User #545430