Um, slash plays with suprisingly little gain. Satriani, meanwhile, uses a lot and compresses the hell out of his signal. Which ought to make it suprising that they use as similar pickups as they do- i forgot exactly what Slash uses, but it's something in the PAF-style family, be it gibson, SD, or Dimarzio. Satriani, on the other hand, uses a Dimarzio PAF Pro, which is a slightly higher-gain, more contemporary sounding PAF, as i understand.
Is this for neck or bridge? Neck, the PAF might be nice, but for bridge, i think what you're looking for is the Tone Zone. Very little treble, but with that midrange, you'll never miss it. It'll run the gauntlet from singing, sustaining leads (the TZ7 in my 7620 has almost wah-like overtones, it's just incredible) all the way down to Godsmack-like crunch through a dark, modern sounding amp- think rectifier, or a REALLY high-gain marshall. In the mahogany 2027 i used to own, it was actually TOO weak in the treble for me- sounded just ridiculously rich clean, and like i said, it'd do Godsmack to a T if you pushed the gain, as well as handling classic rock duties quite well inbetween, but i just needed something with more cut and prescense. So, it's probably exactly what you're looking for.