I agree with pretty much all said above, but would add that the Time Machine assy speed fins TM45 V7/V8 and TM48 are sensational, especially on a tight'ish speed course. I feel the V8 and to a lesser extent the V7 are better suited to larger riders than me, but for my size the TM48 is perfect.
The TM Speed 26 symmetrical fin is in a class of it's own as an Alpha fin in 20-25 knots of wind. Good luck trying to get any new TM's though as they are (hopefully temporarily) out of production at the moment. If you can pry a second hand one away from its owners clasp, maybe with large offers of cash, you will do well.

I have been trying some Lessacher Duo 30 deg. raked speed fins in 22cm, 25cm and 28cm lately and they have been great for 1 hour runs and Alphas with their moderate weed shedding ability. They are also spin out free and surprisingly quick beam reaching and off the wind, and very stable through the chop. I still don't understand how they work, but they do.