I have always found Castlemarine in North Wales better for prop rebuilds than SS developments They were cheaper and did a better job for me. I once bought a second hand Alu prop from SSD and it was fairly naff, which on reflection I should have sent right back but unfortunately needed it straight away.
I think you need a 14p the standard quicksilver one has a cupped edge, which will improve the grip and enable you to trim out more, at least going in a straight line.
Boating parts are always cheaper in the States but you need to be 100% sure its the right one. As for SS props the danger is if you touch the bottom you can break the gearbox and unless you are very sure and confident with the water you use I would stear clear of them.