I'd say no more than 8 psi, if you want 10 psi, but dont use 10 as daily driving, dont go no more than 6 for daily driving with out internals, to "bulletproof" it, get new vavles, valve springs, valve retainers and cams. To go the extra distance, get new rods and pistons (8.8:1).
This is all that i'm in the process of doing, all that i mentioned, im also getting the SF Turbo and a boost controller, so that for daily driving, i can leave it with 4-6 psi, and then for racing, i can bump it up from 8-18, whatever i want. I am still deciding on either getting the bored out 8.8:1 compression pistons or jsut getting stock size 8.8:1 compression, i might go with the bored out though. Also if you can, go with a new crankshaft, but as far as i know though, the only company who makes them is brashboy, and there expensive, so might want to wait for other companies to amke them for cheaper.
Also, on Monkeywrench.com, get the ARP bolts too, just to be on the safe side!!