The toshi's have jog dials and whilst i've never seen the vga screen in action, i agree its probably going to very pretty! However, i wouldn't buy a pocketpc device just for reading ebooks! Not only can you use them for so much more, but its quite a lot of money!
I usually navigate through ebooks using my stylus to click on the next buttons (or scroll buttons) but honestly, its not that much of an issue. Everyone has their own little personal preferences
Actually though, i'm not a big fan of ebooks. The only one that i use now is pocketbible (laridian) and thats more a program than an ebook 8)