You might try looking at some of the other discussions on actually buying a boat that are here. There is a lot more to it and this is a frequent topic here with lots of good advice including some with significant buying/selling experience of their own as well as brokers.
Personally I am not a proponent of narrowing it down to 5 boats...you should narrow it down to one boat...the one you love that appears to be in the condition you want. You MUST be prepared to let the deal fall through but it is a buyers market and another one will appear shortly as JoeShulz recently found.
No longer posting. Reach me by PM!