Thank you for the suggestions.
I've looked into the T-Mobile Wing, but not the dash. It looks like another crowded phone, like a Palm Treo. Are phones that size really optimal for ebook reading?
The Spring Mogul sounds interesting and it looks like a PDA as well. I've never held it, so I don't know too much about it but it has pretty decent reviews. Does it display text crisply? It seems to be a very recent release, which is probalby why I've never heard about it until now.
The thing I like best about my clie is that it has wide display angle, so I'm a little wary about going to a thinner screen.
I appreciate all the advice.