OMS Slipstreams with spring straps.
I am not a fan of split fins personally as while yes, you can frog, heli, and other style kicks they are (in my opinion) not as efficient at some of the other kicking styles as paddle type fins are. I have heard all the usual arguments about splits being faster, etc, but since I don't race anyone underwater I could care less about that sort of thing. And just to qualify my remarks, I did try a pair of Apollo Bios.
The slipstreams are like SP Jets, but made from a resin instead of rubber so they are about half the weight. I also have a set of Mares Quattro Excels, nice fins (albeit rather stiff) but I like the slipsteams the best.