for gooooood waves and ok ones to you cant go wrong with gregs fins .
even if you have the old style black plugs his fin tabs are smaller and allow fin tuning . it should also be noted that his fins fit flush , all 3 of them , in all boards !!! novel concept <img src="/forum/images/graemlins/socrazy.gif" alt="" />
http://www.griffinsurfboards.com/fins.html
for stock fcs fins ,
drivey fins would be the AM line 1 or 2 , pc is better than gf. you can get glass ones from true ames .
next up in drive , the mayhem and simon anderson.
honorable mention would be the stretch fin in pc and the TP-1.
sice your in the UK the CB-3 could be a great option for drive , and they are pg to .
all fin sets from fcs can benefit from a M3 center fin , it can really loosen up a board off the top and " seems " faster with less effort .