No offense taken my friend, the other formats will be kicking around for awhile yet and until there is more and better conversion software available to turn them into ePubs then reading software for those formats will be needed as well.
Whatever you run on your HTC will run like a dream though, they really do make superb gear.
ZuluExpress eBook Libray
for free and indie eBooks in DRM-free ePub format.
ZuluReader ePub Reader for PC/Laptop
, Windows Mobile and Windows CE Devices