If I were you Id look at 2003/2004 Zx6r's. The kawasaki 636 is a awesome bike. It has 36 more cc's, USD forks, awesome brakes. The 2003/2004 placed I believe in the top 20 most innovative street bikes made.
I'll definitely take a look at the Zx6r tho.
What do you think of a CBR? and what year?