From my experience... just buy a tire you like. Pump it up to whatever you like and be happy.
I run my winter tires on the Matrix (sidewall max of 35 psi) at 50 psi and have run them for two years with zero problems. I've run my 44 psi max sidewall tires on the Paseo for two years at 60 psi with zero problems too. I know people running even higher pressures with no problems. I recommend finding a good low rolling resistance tire, and pumping it up to whatever you want. I doubt you'll have problems. IMO, the sidewall rating doesn't mean a ton.