HTC 5800 / Fusion / S720

Any thoughts on which one is better? I've got the 5800, but I am not crazy about it. I find it hard to use (but it could be b/c I am a newbie to smartphones). I like the i760 touchscreen, but heard some bad things about the i760. I can only exchange phones one more time and will be stuck with what I pick, so any advice is appreciated!

I want a smartphone mainly to push email, Internet access, use as a calendar, and open Word docs.

Also, is WiFi that big of a plus in the i760?

Thanks everyone!!

P.S. I am also posting in the i760 forum...