I don't know which model years comprise the platform of CBR600RR you wish to 'stay in'. That said, I pulled up my local craigslist and '06-'08s are all over the place with ~10k miles for 5-6k.
10k miles on a five year old bike is nothing, but from the language and idiotic mods I saw in a lot of the CL ads, they tend to be owned by squids.
I'd much prefer a bike with 10-15k miles on it with an adult owner, maintenance history, and as few mods as possible, as compared to a bike with very few miles and likely some issues from sitting. I'd be ready with the money and wait for the right one to pop up. They sold a ton of them, you shouldn't have to wait long.