I own a blast and love it, it's a great beginner bike. Mine is a 2000 and when I bought it for 2k it had a little over 4k miles on it. I overpaid for my bike, but it was the only one available to me so I grabbed it anyways.
Those prices don't look too outrageous, and you still might be able to talk them down a few hundred dollars. It really comes down to the quality of the bike, how we'll it was taken care of.
Good luck.