So here's the deal: I wan't to have a bridge pickup that sounds as close to what randy rhoads had when he was with ozzy. Now, on the randy rhoads signature jackson-guitar (at least one of them) you can find a pair of seymour duncan TB-4's, is that what I should get?
Depends, what kind of amp do you have? Randy's sound wasn't the product of the pickup, it was the product of the interaction between that pickup and his amp....the same goes for any pikcup.
Actually I'm using a Roland cube-30, which is quite nice and can produce a range of different sounds.
Worry about a new amp before new pickups then, the Cube's good but it's still only a modelling amp...most of the tone is coming from the circuitry, not the guitar. You should be able to dial something pretty close in with the cube anyway, but pickups aren't going to make a great deal of difference.