Re: *looking for the right sound*
I'm with RGR, but think that the Telecaster neck "pickup" will do nothing for your Strat, besides NOT FIT, except with a custom made guard. Sure, go for a bridge Humbucker. But again you might be changing pickguards. Number of mounting holes for the HB will vary from one style to the other. A Hot Rod Fat Strat pickguard is nice, and the SD "Pearly Gates" that usually goes with them is great. I have 2 - one with a rosewood neck, the other maple. Both are modified - more on that later. A Richie Sambora USA pickguard will accomodate a variety of humbuckers as well. DiMarzio Fred and SD Gerge Lynch "Screamin' Demon" are also good choices that I have used. IMO the Gibson squared-off, covered pups will only go into aftermarket, non-Fender guards. Been there as well, with EMG's ... my son's main squeeze.
Okay for REALLY fat sounds that will blow the doors off any Roadhouse or bigger venue, while keeping "normal" Strat tones, try a simple rotary switch which will install in one hour and give you a total of 11 sounds.
I don't post here about this stuff, because I'm not sure what amounts to excessive promotion. It should be fair to say that I recommend and have reviewed a 9 sound rotary switch for Fat Strats on Harmony Central under pickups, maker: Deaf-Eddie. And the other review on HC by Ricky boy explains what the newer 11 sound rotaries do for a Strat, which is what I think you're lookin' for. All the tone we need bro, that's my opinion. Strat man Dwight