Comparison between a Standard Desire & a EVO
You have to bare in mind the EVO was the US version pretty much of a Desire so the comparisons above.
You got a better deal in that IMO than we did.
Comparison between Desire HD and EVO
Not a major difference to really warrant it to be ported. If HTC would do anything, it would probably just converting the current EVO into GSM for you.
Desire/Desire HD is aimed for the European market and it will probably stay that way.
Makes far more sense for HTC just to bring a few updates to the EVO here and there or just put in some new hardware to it...Happened to people with the Desire here (switch from AMOLED to SLCD).
Sorry if this sounds cruel;
Made for Europe, should stay in Europe xD