I have a Blackberry Curve 8310 which does not have Wifi but does have some nice features like GPS and Video which the next model "up", the 8320, does not have. The 8320 DOES have Wifi, however.
I thought I'd miss Wifi but if you have a decent data contract you don't really need it. I really like GPS and think all new phones should have it. It's worth it for Google maps alone.
A few friends each have s Blackberry Storm which they swear by, but I like the shape and size of the Curve.