Sandman, if you plan to keep the boat in the garage, then I think your options are limited. 4 boats come to mind as a possible solution. In no particular order...
First off, Ribcraft 4.8m. Normally available in single or double jockey configuration. I've seen a 3 seat version which was introduced last year. My one fits in a 18' garage with inches to spare. Come on the market occasionally. Great sea-keeping boat. Ditched the traditional A frame for a collapsible light pole. Some come with underdeck fuel tanks or twin portable tanks. I just added a Zodiac MilPro fuel tank, so now have 75 litres onboard.
Searider 4.7m. Now these things are uber scarce. All the attributes of a Searider which you want to keep, you just need to find one. Perfect with a Yamaha 70hp on the business end.
Ribquest 4.8m. Thought the Searider was scarce, try finding a second hand one of these. I was literally a stone's throw from buying new. Even visited them in Sheffield. Beautiful boat. Remortgage the house if you have to.
Searider 4.0m. A loyal following as you'd imagine. Perfect with 40-50hp engine. Lots of examples out there, just be wary of what you buy... it's a minefield in terms of condition.