If you already have an IOS device like IPhone or Ipod Touch. Keep away from IPAD2. Its basically same experience in a bigger screen. I am a Console gamer, for playing easy and timepass games my IPhone First Gen is sufficient.
If you already have a IOS device, better choice would be an Andriod Tablet. Honeycomb is very good. Still edgy but will improve with further updates.
Right now my bet is on:
1. Notion Ink Adam (only if it is available on retail).
2. XOOM (Only gripe is higher on price)
3. Samsung Galaxy Tab 8.9'' (Only after reading Reviews)
HP Touchpad is too cool. But not on my list because lack of applications (will take time).
A Tablet should be atleast 9''+, because 7'' is too limiting for enjoying the graphic poweress and web browsing. IPAD screen is perfect for web browsing (gripe is lack of Flash).
I have more than 100 Apps on my Iphone but I rarely use more than 20 apps. So App count on IOS and Andriod platforms doesnt matter much to many.