I'm not so sure about the whole STi tranny is a lot heavier theory... my car weighed 3089 last night, which is only 9 lbs heavier than stock WRX curb weight! 'Course that was with only 1/4 tank of gas, but I don't see 12 gallons of gas weighing 200 lbs, which is the number that's always thrown around.
But before I could get to work balancing the car, I accidentally rolled it off the scales and into the closed garage door.
I'm a fucking idiot... doesn't look like there's any real damage to the door, but one of the hinges put the hurt on my rear bumper.
No e-brake in the corner pocket! 
That's when I decided I was too tired to try to get the suspension aligned. Hopefully I'll be able to get out of work early enough to get it done before driving out to Lovelock. At least I've got the garage leveled, which took about an hour.
Anywho... I think I'm looking at about 3300 lbs at race-weight (1/4 tank of gas + driver). Not bad for what's supposedly a much heavier transmission. I'm shooting for 1000 lbs per tire in the front and 650 per tire in the rear, which is right around 60/40. Of course the more weight I can get in the back to balance things out, the better, but I'm not so sure there's much I can do w/o getting way too jiggy w/ the ride heights.