Guitar Strings, Amps, Pickups?

What do you think the best brand of strings is for me. I like the blues and i have a fender strat? I use about 52 gauge. Also, right now i have a pretty bad amp, what kind of amp do you think would make sense for me since i like the blues and have a strat? I would like to spend a little more money on another one. As for pick ups, I still have the basic single coils in there, what would be the best choice for a good 60's rock and roll/blues sound. What are humbuckers? Keep in mind that I would like to have that 60's Eric Clapton and 80's Stevie Ray Vaughan tone in my strings, guitar, pick ups, and amps. Thanks