I swapped the original pickups for a set of David White 'Old Glories' back in the early 90s, which I'm sure Tim won't mind me mentioning as they're no longer available. As they're part of the guitar's history I won't be changing them. They sound pretty good!
I remember those pickups having a very good reputation - always meant to try them, but never got round to it. That guy has passed away now afaik, so it's gonna be tough to source a set. Plus, I don't get on with Strats anyway so its unlikely I'll be needing Strat pickups any time soon. I have 'Roo-itis', except with Strats rather than Teles.