You'll be able to take your 3ghz to 3.2 easily. My 2.8C goes to 3.25 without breaking a sweat, and that was even before I replaced the thermal tape with paste
Just take it a step at a time, increase the FSB a little bit, and make sure it POSTs, then take it a little bit higher. You'll be running at 3.2ghz in no time

As for your question about XP recognizing it as 3.2ghz, it'll tell you it's a P4 3.0ghz running at 3.2ghz. So you'll be able to tell it's originally a 3.0ghz but it's overclocked to 3.2ghz. Hope that helps