Everytime I play the 5th 6th or 7th fret on the low E, the middle pickup on my MIM Strat starts to buzz. The buzz doesn't get transferred through the amp, but just (what seems like) around the middle pickup. It is relatively quiet but still bothers me alot. I can't stand annoying sounds (or people).
Get a not cheap strat? Thats all really. sounds to me like the spring that floats the pickup is loose, try a new spring, if that doesn't work then you'll just have to deal with it I guess.