I decided to go with this case to start with. It was $7.49 shipped to NJ and I think it's an OEM HTC case:
http://www.expansys-usa.com/d.aspx?i=187227
The HTC accessory site in the UK has a bigger picture if you click on it:
http://www.htcaccessorystore.com/uk/...7&sbadd=187227
Seems similar to the OEM TP1 case that came with the Sprint one.