Personally, I'd wait.
The iPad is a lovely device but for function it's never going to even come close to what's on the way. The Exopc is already miles ahead of the game, but this is only the beginning.
Here's an old video of one of the prototype.
http://www.youtube.com/watch?v=IFoNAXGQ3ncIt's now released, and you can find more video's on youtube.
As I said though, this is only the beginning. Over the next 6 months there are going to be at least 15 new Windows 7 Tablets released and with that we will see the prices drop as well.
The beauty of windows is you can install what you want, and it does not have to come from an App Store that's vetted and dictated by someone like Apple.
Regards
James