The more boats you look at the more you'll have that aha moment when you find "the one". There are a lot of things you can put on a check-list but those are all things you'll have to replace or repair on all boats at some point and can all be part of negotiation. They're all holes in the water we pour money and effort into and that one day when you realize you've got your 30 footer "just right" will usually be the day you start searching for that boat five feet longer so you can take the kids a bit further and bring their friends, or spend an extra night or two in a new port. The one thing you have to make sure of is that you like the looks of her. Everything else can be fixed.