Considering the history of cat rigs as work/fishing boats suggests that speed was of little concern in this design. I have seen a Marshall cat using a spinnaker, but beyond that I wouldn't by a cat boat for sailing performance. I owned a PicnicCat and a SunCat, which were both fun boats to sail, but not light air wizards. These boats have other endearing qualities which in many cases overrides their inherent lack of speed and pointing ability. Keep in mind, the faster the boat the shorter the journey and isn't that what it is all about?
If your primary requirement is speed then you might consider a trimaran. I owned two of those and they are truly sailing magic in any kind of wind. I loved them for what they were, and I love my current 23 PH for what it is. There aren't many boats that perform well in all ranges of wind. Every successful and popular design has it's own distinction which brings it's owners the joy of sailing.
If you love cat boats then you will be happy going at any speed. You might start with a PicnicCat to see how that works out in your conditions. Low cost investment that you will probably recoup when you sell. With out having researched this, I would imagine the SAD would be similar for the two, with proportionate crew load. ComPac cat boats are their answer to true trailer sailing with easy and quick rigging at the ramp. They are in my opinion exceptional in this respect, and I enjoyed trailing mine to new sailing grounds.