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I run my 18's on "normal" pressures on my 03 WRX. 34 F and 32 R.
Or 33 F 31 R as if that makes any difference! LOL, but mentally I felt better.
I would agree with the tyre presures above for day to day use, but I would always recommend having a go at different tyre pressures yourself. I recently went on a Sunday blast (185 miles) running 25psi cold pressures and the car was fantastic all day, have a go yourself, I certainly wouldnt worry about a couple of psi here or there