Something that the OP might consider is the new Asus 12" Win7 tablet the Eee 121 that runs a full version of Win7 Home. It's in the same price range, at least here in the US, at about $1000-$1200. So far I haven't seen any concrete reviews on this one but it's on my short list just because it is a larger screen and at 16:10 it's better screen height wise in landsacpe than a 16:9. It reads as a small difference in the ratio but really it is better.
The battery life is relatively dismal by today's standards for a tablet, not much better than the Mobi One offering at about 4hrs, but it is a larger screen and maybe a bit more capable CPU using the Dual-Core i5 470um vs the Mobi One's Atom 1.6ghz but I have not paid a ton of attention to CPU specs for a while and really don't know which models give the best bang for the buck.
At least it's a comparable platform with the Mobi One offering. A shame one the screen for the Mobi One being 16:9 as I mentioned before that is just a bit too wide screen for a tablet, or laptop for that matter and how I would be using the device.
I am really intrigued by the ability to run a full version of Dragon NaturallySpeaking on a 12" slate to dictate my notes while I work then port them over to the primary workstation for correction then integrate in the database. But based on playing with Dragon NS on the Touch 4 it is darned accurate these days and that was just a free web based version. It's a solid alternative for me over a keyboard as my dictating won't bother anyone else as it's just me.