Winmo phones are your best bet...they have a built in app that allows you to remotely control your desktop...whether its any good is another question entirely...ive never used it when i had my touch diamond.
Essentially the same spec as the Touch HD but alot cheaper. Saw it yesterday sim-free yesterday for £189.99 from a very popular online retailer, obviously cant link to it here but a quick search will reveal where.
When you consider its spec execpt for it 3mp camera .(800x480, WM6.1, Wifi, HSDPA, Bluetooth etc) its an unbelievably good price.
Their is also a vid on you tube with the Acer alongside the Touch HD which shows how much faster the Acer is and it also has a larger capacity battery...