Check out my post
"
My miss my old Touch, should I go back? "
http://forum.ppcgeeks.com/showthread.php?t=88060
I got some real good feed back on this very issue... And at the end of the day, I've decided I like the form factor of the Touch 100% more then my Diamond (CDMA version); but due to the features of the Diamond, I'll be sticking with it. As far as typing goes, try the TouchPal keyboard or the SPB Keyboard apps, they are both great and help tremendously.
With that being said, their are some really nice devices just around the corner; Sprint will be getting the Touch Pro 2, Hero, Pixi and has the Pre... so weigh your options well!
_ixl247