Hello

You might have a hard time finding a 5.2 in decent shape.. the boat has not been produced in a long time... Some of the older boats had a bar in the center of the tramp which took some getting used to. Best ask before you travel

I think that a Nacra or Mystere 5.5 would be a really good choice for you. they have boards and can be sailed solo as a uni and can be righted solo (main only). The Nacra uni's are actively raced in Michigan and you might be able to get a good deal on a uni.... the Nacra 5.5 sloops are active in Florida and you might be able to find one down there as well.
The Mystere 5.5 was in my opinion, the nicest sailing of the Mystere line and it has kick up centerboards. It will be the driest of all the boats you might consider.

Finally, similar to your 5.7 but a lot easier to day sail in a breeze would be a Dart 18 or perhaps a Nacra 5.0. This boat is also boomless and with skegs. They will be slower then the 5.7. Darts are reasonably popular in Canada and they have a very social class organization as well.

The hobie 17 sport might be really burdened with yourself at 220 and one or two others on the boat. Solo you would be in great shape.

Good luck hunting... sounds like price and availability might be the real hurdles. Figuring out a new boat is always fun!
Merry Christmas.

Mark

.