@ red-beef: a .008 set on a Gibson is for pussies! Since Gibsons have got a smaller scale length than Fenders, Jacksons or Ibanezes, string tension is significantly less. In standard tuning I would play a .010 set, in flat tuning probably an .011 set. I tune to C, so i use a .012 set.
If I could afford a PRS, I`d give it a try, because I think they better suit clean sounds without sacrificing the roaring Gibson distortion. But they are way too expensive here in Germany, about 3000 . My second hand LP's have been significantly cheaper.
And as for the lead sound: I think it depends very much on the amp you use, because my leads are not shrill. I use a Marshall JMP-1 and a Marshall EL 84 20/20 Poweramp. Just 2 x 20 Watts, but fucking louder than you need.
And to preach it again: DO NOT USE STANDARD MARSHALL CABS!!! They suck...
Use cabinets with Celestion Vintage 30. They rule. Celestion Greenbacks are also OK, but those cabs are not made for stereo use, so nothing for my setup. Marshall 1960V Cabs have got Celestion V30s, as well as Mesa cabs and some Engl cabs.