The first yacht I owned was a Caprice Mk V, a GRP version of the Robert Tucker bilge keel, sloop originally designed for plywood.
I was in my 20's, it was affordable and I had read Shrimpy, Shane Acton's account of sailing around the world in an early plywood Caprice, not that I had those aspirations at the time, but it seemed like a good recommendation of a tough little boat.
The reality was perhaps a little different, and while it was great fun, it was also tiny, to use the toilet you had to have your head sticking out of the fore hatch, and the performance of those twin keels wasn't great.
That said it was a great entry into to sailing, cheap and affordable and I learned a lot. I found this on boatdesign forum from a few years ago, a modified Mk2 guaranteed to start a conversation in any anchorage.