Dan, not sure I would be too happy about buying a boat that doesn't have advice from the ribnet community but thats just my opinion
Anyway if I was in the market for a boat right now I would be looking at some of the older cobras (even a couple on fleabay) however they are very big boats and not sure about your towing capacity?
But the best used boat I have seen on here is the 6.5m Osprey Vipernax that was advertised in March on here (and again in ebay in June I think). You could buy the boat and use it as it is or if you have change in your pocket after buying it you could add an endless list of improvements / upgrades to it. If I didn't have my Ribeye that is the boat I would have been buying.
Anyway a boat purchase is personal and everyone has different taste, wants and needs and this rambling from me could have been completely useless for you but you never know