Hi I am looking at buying either a used 04 450 or 04 Raptor 660 pretty soon. Both or in mint condition and cost the same. I will be trail riding mostly and was wondering if there are any known problems with either of these machines and which one do you think is better. I don't really care about the no reverse on the 450. Also which one is more realiable or has less maintenance to do on it? Thanks!