Hi Reddo,
It's not necessary to spend the money on something like Quabba's for the ONE.... it's not a performance board and the benefits will be meaningless.
On my ONE 10'2, I use a thruster setup, with 3 fins all around 5"s
This is a good combo for surf or flat-water.
It tracks well for paddling and allows for easier turning in the surf.
Just buy a moderately priced medium to large thruster set