The only knock on the 03 is your legs get roasted from the heat. I think they changed it in 05 or 06 so that the heat is redirected so thats something to consider. I would keep looking places will want to get the 07's off the floor with the 08's comming in.
My frind just got an 08 Busa for like 10,300 from a dealer up in MA that was going out of business. Whats worse was they had 07 gsxr 600's going for 7100. I found out about 5 hours too late
Also do yo uwant the "automatic" or standard shift.
Tom