WTB: Supersport or new supersport

I'm looking for another bike, with the following characteristics:

-2003 or newer
-under 20,000 km (lower the better)
-600cc class or similar (eg, 636cc)
-Must be certified or certifiable prior to sale

I'm considering the following models so far: CBR f4i, ZX6R, R6, YZF6R,

I'm presently leaning away from the GSXR and the CBR RR. I would consider a CBR 600RR, but so far the prices seem too high.

I'm in no rush to buy either, its coming up on the end of the season and I think prices will be coming down. My budget is flexible, but your price should be reasonable.

Please contact me at mathewrobertson@rogers.com for the fastest response.