I also like Craig'sList for boat searching if you want to branch outside of YachtWorld. I have seen some boats cross-listed both on YachtWorld & Craig'sList so I know that Craig'sList does have good boats.
Yes, you have to be careful.
Yes, there are a ton of really crappy boats.
Yes, you have to use a million generic search terms (especially if you are not looking for a specific size & actually have a range) & even then you get things popping up that you never wanted. (btw, I limit my searches to a price
range, the word "sail" & only ones with pictures in the boat section -- then I subscribe to the RSS
for that search & get new hits anytime something is added).
But for whatever it is worth, there are some acceptable boats on there & it never hurts to add just one additional resource to the list when you're looking for a good boat.