I used to have a 5.5 Sloop, with a spin. I would sail it Uni with spin sometimes. The biggest problem I had was the helm with the spin up. It had lots of lee helm, even when I went deep, I think the boards were too far aft or maybe the mast was not raked back enough. Try to borrow one and test it before you spend the $$$$ on a pole, sail, blocks, halyard, sheet, etc... While it would be great for a long distance downwind race, around the cans it was not good. I later bought an Inter 20 and could not believe how well ballanced it was with the spinnaker up! I could actually put the tiller down, trim the chute with both hands or adjust the jib, or downhaul, whatever, the boat just tracked straight ahead...couldn't begin to do that on the 5.5 with spin. As soon as the chute went up, it wanted to head down, alot! Good luck but don't expect a miracle.