Kirsch,
Be careful about re-arching leaf springs. It all depends on the method used by the re-archers. Among other considerations the heating and oil quenching must happen at the right time and under the correct temperature and duration. I had the factory springs on my FJ-55 Land Cruiser re-arched to give a 3" lift. This was a very reputable business; the ride did not suffer; it was cheap and I was happy. After about 6 months of hard use the whole rig started to slowly and inexorably settle back down. It took about 2 years for the suspension to resume the position of stock, which was a drag since I owned the rig 14 years and put 185K miles on it. Bummer. So, from my experience, pass on the re-arching of spring packs and pay for whole new set of springs with your name, usage and truck weight on them; Unless they offer a money-back, no sag guarantee.
My favorite 'custom' spring company is National Spring in San Diego. It's a family business and they know their stuff and offer solutions. Deaver is another good outfit.
jefe