meh,
gorilla glass is overrated (just like in the iphone 4) and costs a bitch and half to replace. GPU kinda goes along with the better cpu (implied).
My boss has an epic sitting on his desk right now and it is NOT thinner than my HD2...
as far as I can tell the Sense porting has been abandoned, whether or not froyo source is released, we'll have to wait and see,
but overall the Evo and HD2 get much more Android development than the Epic does. I've been running a fully stable CM7 ROM on my HD2 for a while now.
I'm not saying the Epic doesn't have some cool shit, It's not a bad phone at all, but for my money, if i WERE on Sprint, I'd rock an Evo.
Thankfully I own the only phone on the planet that can dual-boot WP7 and Android 2.3.2