Hi,
I plan on buying an H/PC with Windows CE 3.0 (HPC 2000) I would like one with USB support, CF Slot, resolution of 640x240 or better and is under 200 dollars USD on ebay, etc...
i'm afraid you'll need to spend more than 200 if you're really desperate to have usb support. especially if it's full usb support, only ce.net can do it or the intermec with the deje drivers. or you can get a ratoc cf usb card... very expensive.
I dunno if the mobilepro 790 has USB sync support, but it has all the other features you mentioned and they're going for like $120 in ebay, so you might get one of those, while the prices are still low.