Shark 24 owner
I have had my shark for 2 years and love it. Really easy to sail single handed, does well in high winds, and a classic look to them. I have one of the first ones made (sail #43 made in 1963). I totally rebuilt the boat over the course of 18 months, took everything off of it and took everything out of the cabin. I started with a hull and rebuilt the entire thing.
The only downside is the lack of cabin space. You need to be creative and use every square inch of storage under the cockpit floor, under the bunks,etc., if you want to spend more than 1 or 2 days staying on it, but it can be done.
You should be able to find one in decent shape for around $5000 fairly easily. If you look around,you may find one much cheaper. Good Luck