Well, it depends what kind of user you are targeting for your games.
If you will be looking at casual players, get something low-end, like amazon kindle fire. It is by far the most popular android tablet. Although people use it mostly for books, anything that will run on kindle fire will run on pretty much any tablet out there.
I am not sure of this acer - never heard of this model before.
Samsung Tabs are good, and I would call them mid-range.
Nexus tab is great, as it is pure android and it is already open for the developers (so no rooting etc, to run your own .APKs).
Just think of a user base you want to target - go on some android website (http://www.androidcentral.com/ is a good source) and check available and popular tablets for this user type.