http://cgi.ebay.com/HTC-Touch-Pro-Di...330155004r4443
Here ya' go. $6.95 with Free Shipping!
Original oem cable
Model: DICU5310B
for Diamond/Touch Pro
If you intend to use your phone in Diagnostic Mode(DMR) at all, or with the adapters as stated in the post above, this is the one you want. Otherwise yes, the regular mini usb will work. Also, some of the regular usb mini cables would not charge in my car, where the oem cable always will.