Do some reading on wololo.net, very explanatory articles regarding what the difference is between a kernel mode exploit (MSET, CFW, Gateway+clones) and usermode exploit (SSSpwn)
Kernel mode can boot ROMs and userland can boot homebrew. sssPWN will never EVER run ROMs no matter how much one crosses their fingers or prays to their higher being of choice at night. Sorry.
That is, of course, unless a very VERY talented duel skill amateur developer/reverser engineer with very VERY expensive equipment can find a kernel vulnerability and use smealums savegame exploit as an entry point. (A.K.A what the devs call an "privilege escalation")
So yeah, i wouldn't be getting my hopes up and just get a Gateway card so you can get in on all the action.