Depends on what you want. These are all consumption devices, IMHO, with little work being done on them. I have the iPad 1, works fine, but I don't love it. I tend to use my phone more than the iPad to do stuff because it's very convenient.

The Fire is nice and small. My wife loves hers, but she reads and does a few games and that's about it.

The Nexus looks nice, but haven't seen one.

I have tried a few Android tablets in the store as well as the iPad/Fire and the browsers on all of them flake at times. Course, since the browsers on my laptops sometimes flake, I'm not sure it's that much worse.

Surface is interesting, we'll see about the cost.