Depends on whether you want classic strat, super strat, or humbuckers. I'd go out on a limb and get something off the beaten path like some Rio Grande singles or something though. No point in sounding just like everyone else. Maybe one of the slightly overwound Texas style sets? There are
so many pickup choices out there, get a few used cheapies and experiment

I have Carvin singles in my Strat and they sound fantastic as well.