Considering buying one of these two preamps, mainly because they combine both great 2 channel performance with exceptional HT performance. My question is this: Is the SSP75 worth the extra money? From what I can see it offers a better power supply, balanced outputs, and THX Ultra instead of THX EX. Does anyone know if Classe intends to have these units upgrade to newer formats? From what I can tell, the SSP75 costs about 2 times as much as the SSP30 in both the new and used markets.