I think color displays are about 1,5 years down the road..So you'll need to have some patience.
I decided I'd give b&W screens a try,since books are generally B&W.
Also, in 2 years time it's time for a new device anyways. Then I'd buy a color one.
At least I'll have an idea about what I like and dislike about an e-reader,and compare the newer, what it has to offer.
Has anyone seen the OLED designs of lately?
http://www.youtube.com/watch?v=NcAm3KihFho