I just won a Dell duo at work and i love it. The only downside honestly is that the windows 7 OS holds back what the touch screen can do. The touch screen is extremely accurate (I have a few iphones and messed with a ton of ipads) and sensitive. honestly for the price you can't beat it unless you actually get a tablet. It comes with Windows 7 Home premium and will that is touch screen capable but things like the on screen keyboard are too small to type like a real keyboard.
For the specs you aren't going to get a better tablet - in fact i've checked and most tablets that come close to these specs (core 2 @1.67ghz, 320 gb drive, 2 gb ram, 300+ shared video memory).