I would get Koni's or QA1's for the rear and call it a day. You did a really similar build up to my car, how does it perform ?

I have..

MP 1.22" bars
FF Stage 4 'secret' box...a little firmer than the normal 3.
Konis front and rear Full 3 on front, 1.5 on rear.
Braced stock LCA's
Moog 9/16" tie rods, (I thought I got 11/16" but I mis ordered)
Poly bushings with reg Moog BJ's
CAP Tubular upper control arms
stock 15/16" front sway bar with Energy Suspension greaseable bushings
stock struts with Prothane bushings
stock rear leafs
Addco 7/8" rear bar
Yokohamas in 255/60/15 in front and 275/60/15 in rear
11.75" discs with Firm Feel Carbon metallic pads and MP alum MC in 1.125" stock 11" drums in the rear and I will put the FF shoes back there too.

I'm going to drop the ride height all around a little more, and align it soon. I hope for a really good performing combo, and when the tires are done for I will put a set of 17's on it and really tear it up.