To my knowledge these are the boats that are out there. There are images of most of them in the "C1 Rec Boats" link...
Acrobat: Comes in two versions, "Master" cut, which is a shorter boat, and quite honestly is almost a different model than the "Standard" cut. Master cut is faster cartwheeling, slower on teh water, and a lot of fun. Standard cut is faster, usually slightly higher volume, and one of my favorite squirt / cruise boats (assuming you're into going THROUGH waves rather than over them
). Several low-low cut versions are mystery capable
Aerobat: Older design, Will Lyons has the only one I've ever seen images of. May or may not be mystery-able, depending on your weight.
Edge: Also an older design, great for cruising / squirting as well, but a bit more forgiving than the Acrobats, and a bit higher volume
Meltdown-Basically a reworked Fantum (If my memory serves me correctly). I've never seen one, and have tried to order a new one twice from Meltdown in the UK, and have had no success doing so. Several folks in the UK have them, and they look like nice boats. I'm not sure how they rate in the mystery category, however.
Oxygen: By far the most mystery capable boat built to date, BUT really, really, really tough to boat. Will make class II / III feel like V. NO rocker, asymetric sides. Fun as a toy, but I don't think I'll ever be comfortable in anything this twitchy to control a mystery move.
The above analysis has caused me to try and build my own Squirt boat. A lot of folks have cut down old slalom boats (which, quite frankly, is all the Acrobat, Aerobat, and Edge are...just tweaked slalom designs)...you'll find others other there, which, if you're heavier (say, over 180lbs or so) may work fine for you. For those of us in the lighter crowd though, there's just too much volume left. Enter...the Maven (which, BTW, I pick up the finished, sealed mold TOMORROW to start waxing twice a day for a week or so in preparation of the building of the first production boat). I designed it to have the low-volume of the Oxygen, but with the forgiving ness of an acrobat bow and viper stern (this will make more sense when I post images of the finished plug in a few days...I'll be picking that up, too), and an enlarged cockpit area (a la Cascade or Atom).
The "work-in-progress" boat worked very well, so the design was cleaned up, tweaked, and sanded (and sanded, and sanded, and sanded) into a plug to pull a mold off of.
We'll see how it goes. I'll be very honest and say it is NOT going to be as perfectly shaped as a PS Composites boat (this is my first one, remember!) BUT, the hull is super-sweet, as is the volume distribution.
If you have any further questions, let me know...
Oh-two other boats, that I consider "hybrids":
Groove-really a surf and cartwheel boat
Viper-it can be cut down enough to mystery, but wasn't really designed for it. It's really a stern-squirting cruiser.
)!