P-90s and a Rat pedal are a magical combination. I have P-90s in my '65 SG Special and with flat wounds I can get that guitar to sound either twangy for country, or get that cool Robby Krieger Doors sound (neck pick-up with tone rolled back a bit and the Rat about halfway on the Distortion and Tone), also that full Eric Clapton "Woman Tone" of early Cream (not that I care for that much) and finally that Ramones/Pistols punk sound when needed. The Country guys all roll their eyes when they see me break out the "Devil Horned Heavy Metal Guitar" (as they are all attached to their Tele's and Les Pauls) but the SG is a very versitile guitar and about half the weight of a Paul. The SG Special had P-90s and was the choice of guitarists like Pete Townshend until about 1972 (when he found them harder to aquire and switched to a Les Paul) I like it because it has a bit more wood around the pick up that a standard issue SG with Humbuckers in it. I toyed with putting in Alnico mini-humbuckers (from a Firebird V) but decided I like what I have so far.
The other pedal I like is a (not so) cheapo Ross Distortion Pedal. I got mine for $5 at a garage sale (my second one) and later saw one at a local music store for $100 or so. I just laughed and laughed about that. That store will never sell it for that price (even in total mint condition) they weren't that good. I could build a knock off with some circuit board and some over-the counter Ratshack electronics.
Go figure. There is another solution, Build your own dang pedals! There are plenty of schmatices out there to borrow from. Anyone thought about that?