Re MFC fins, I would have thought that the Liquid Pro (
http://windshack.com/products.php?cat=windsurfing&scat=4&id=60) would have been a better choice for a freeride board, though they're still relatively expensive at $195.
Many suggestions about using expensive racing fins from Tectonic and MFC on an older model F2 Freeride board, though has anyone considered that $200 plus is a lot of money to spend on ONE fin for a board that is probably only worth $500-$800 on the secondhand market, not to mention the fact that using a wide range of sail sizes on a versatile board like the F2 may require a quiver of fins?
I've got just one 85L freeride board that I use in all conditions which was built around the same time as the F2 Ride 279 (circa 2000-2001) and the thought of spending $200 or more on one fin is unrealistic!
Bayblaster, suggest you check out the Select fin selector at:
www.select-hydrofoils.com/fins/selector.wrd?smsid=04d4896e5d57dd484ba7b2b4de725281#Category to select would probably be 'Freeride/Supercross boards > Width from 58 to 62cm' as the F2 Ride 279 is 60cm wide according to specs. Original fin on 279 was apparently a 32cm Concrete Wave Convertible so the recommended size of around 37cm may work ok with a 7.0 sail and person of your weight.
Bayblaster, whereabouts in Victoria are you located?