id recommend slam specialties re7 bags. thats what i just got, and i used to run rs-72's, these are just updated. you dont need dual port bags at all, im running single port bags, 1/2" line, 3/8" valves. 2-5gallon tanks and 2 compressors. almost identical to my last setup, and the front tires would leave the ground at 175psi.
www.streetissuecustoms.com has some great deals, talk to Doug, tell him brian sent you.