I did the HTC WM6 update, very slow when compared to vp3g custom rom,
Check it out , You can still go the HTC and get the Windoz 6 rom
vp3G's WM6 v3.62 AT&T ROM -- [Curtain call for Hermes?] - xda-developers
more roms
XDADeveloperWiki - Hermes_Upgrades
as for getting the HTC ATT rom
you will need to join club HTC then be sure to select the usa for country, it is still on the site.