"I LOVE RIBS" had a Zodiac Hurricane 540 for sale. Super clean. I saw it at Catalina last weekend. But, he was asking double your budget. In the 7k range, you'll mostly see more of "yachty" types of ribs... Nautical, Apex, Nouvarania.
Though, if you're willing to travel, this might interest you (though it's a bit short) :