The CBR looks great but the Ninja would leave it behind as if it were pulling a boat anchor. The Ninja is the same or less money so it's a no brainer to me. The caveat is the CBR can be had with ABS.
I had a 2008 Ninja250R for a season and I really liked that bike. If it were not for the fact I just bought it to repair and sell for a profit I'd have kept it. Plus if it were any color but that Kawasaki green which I don't care for, especially on a streetbike. :roll:
My girlfriend at the time and I rode that bike 5,000 miles in one summer.