I think almost all brand name tablets are on ICS now.
This point is very important - it makes the device more like an iOS one - more likely for updates, more fine touches as Google's cred rests on it
Have you actually used something like the Asus Transformer?
It's very, very good. I have a MBP, Linux Laptop, Windows Laptop, iPad2, iPhone 4, Galaxy S, an old 7" no brand Android tablet and the Transformer with a keyboard dock, and the Transformer gets the most use for general email/web browsing use.