[quote=Wolfman]IMHO, for what you describe the first choice would be the 570, second the 500. Buy whichever one is in better condition.
I wouldn`t go after the 5.8NA unless your are SERIOUSLY committed to that boat, it is a beast and takes quite a bit to sail. It is best sailed with 2 relatively experienced people.
Both the 500 and 570 are awesome boats, reasonably simple to rig and sail and forgiving of mistakes. The 570 will handle 3 people a bit better than the 500 but both will work. The lack of daggerboards and a boom are really a plus three people and/or and a younger child on board. They can also be sailed as a uni rig single handed relatively easily.
I currently sail a 5.2 and am relatively inexperienced but have done well with it and love the boat. That being said given a choice I would toss the boards and the boom. If I could find a 570 nearby I would jump at it!![/quote]
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