Good lists so far, even if I can't afford classics like Greg lists.

I'll add only one guitar type/pickup, of which there are many models available...
Something with P-90's. Heck, you can get them on all kinds of semi-hollows, LP's, Tele's, and on and on.
Humbucker lovers who don't like single coils like Strat's and Tele's should give them a test run.

"I was used to playing humbuckers, but after putting in a pair of custom Seymour Duncan P-90's into one of my '70 Deluxes, the resulting tone was a bit brighter, a little warmer, and more transparent than the humbuckers.
But what I really like about them was there solid midrange, distorted creaminess, and their ability to still hold definition when put through an over-driven tube amp. I'll put with the hum any day to have my current tone." -Mike Ness