I just got a IS loogey quad and wanted to get some feedback on what size fins to get for the second set. It came with a pair of 11.5cm carbon fiber fins. I am guessing that the answer is going to be "it depends on your riding style"... .so here goes:

the board is for my wife. She is 5'10" and "light" (been married to long to reveal her wieght).
She has a surfing background but has only been wakesurfing for the past year. She will want to be able progress with the board and be able to dabble in all of the tricks/skills... i guess i am asking is:

"what fin cofiguration will offer her the most versatility"

on the IS site they have a few sizes to choose from:
-11.5cm
-7cm
-5cm
-7cm 'trick fin'

you can see the options here:
http://www.inlandsurfer.com/shop/Results.asp?category=6

thoughts, suggestions?