the SVT was moved out of DSP and into FSP with the other Foci. I believe it was moved just before the 2012 season.
You're right, the Focus is in H-stock but there is not an HSP class, so it gets bumped to FSP.
Normally you take the Stock class (AS, BS, CS, DS, ES, FS, GS, and HS) and add a P to the end to get your SP class, but some cars are just whacky.
Edit: 2k for an LSD??? that seems way over priced.. is that with labor included?? A Torsen LSD should only cost 650-850.