I have one touchsmart which I bought to play with - not sure if the touchscreen would be used much - if you watch you can get them for under 1,000 and even in the 800 dollar range as open box - One issue - wireless keyboard and mouse are not great - often loses sync, batteries go dead - wish they came with just regular mouse and keyboard.......might just switch.
Dell and Gateway are all making touchscreens with Windows 7, but most are HOME (don't get Bert going) and if you want to use on network with domain I think you will have to upgrade to PRO and may lose software which comes with computer. I think touch is fun to play with, but is not worth money. You can actually build your own all in one, nontouch with small ASUS XP machines that bolt onto back of LCD flat screen -