ive got squier strat which is really good, im not really an expert on guitars but theres nothing wrong with it and its great to play, only problem is, ive had 3 strings snap in 3 weeks on the saddle, but after having it checked out, its just my playing style that did it and a bit of bad luck. if you're not that bothered about prices, the setup pack is about £200 and if i were you, id ask a shop about getting new pickups and, depending on the model, a thicker scratchplate than 1 ply as the screw positioning on the scratchplate is lacking at the top which does make a handy place to wedge my pick, but when somebody else was using it, they managed to push it down inside my guitar which was a nuisance. ive not got any new pickups as of yet, but my suggestion would be a bridge seymour duncan hotrail which is a small form of humbucker pickup. as for the bridge and neck regular fender or seymour duncan single coils for strat would be a sensible suggestion and you'd want to get the hotrail coil tapped, which means that you could use it as a single coil pickup aswell.
if you dont understand bits of that, post back here or e-mail me at email@example.com as i cant be bothered explaining stuff if you already know about it. if you do want advice on pickups, i know the basics and could suggest a few arrangements and modifications that would give you a wider option although you really should ask biblical about them as he knows practically EVERYTHING