I think you won't get a test sail from anyone, but when buying from a dealer you'll usually get a three month warranty. Check with the dealer what is covered by the warranty and decide for yourself whether it is enough for you. I understand that the terms of the warranty given by the dealers over here in the good old Netherlands are usually quite fair. You can also decide to buy privately, the risk is a bit greater (no warranty) but the price should be lower and you might be able to get an eager seller to give you a test sail. I think your of idea of trying to go out on different boats to see what they're like is great, look around on the various club websites, go out on the beaches. Another idea might be to look out for boats that obviously haven't moved from their place for a long time if you can trace the owner you might make him an offer. If you're still looking in april, PM me, maybe I can take you out on my old barge.