most people i've talked to run a 2:1 ratio (like 32-16 but it really doesn't matter the gearing as much as the ratio). my friend sean had his raleigh set up as a SS for a while with a 2:1 and he could take hilly trails no problem.
and any bike is good enough to convert to a SS

especially a bike you've already paid for... and the paragon is a nice bike