1. An overhaul on a faucet stem should not leak within " a few months" if you do it right. Use just a dab of dope or teflon tape on seat thread. Get monel seats. Use blue or red washers, rather than black.
2. Having said all that, if this is a 2 or 3 handle Price Pfister, most models you can remove the seats and leave them out. Then, replace the entire stem with ceramic disc versions. You should get a "remodel kit" which has stems and the proper trim pieces to fit.