sugestions on what front suspension to use

I have CAP upper and lower control arms on my Challenger, as well as the adjustable strut rods. I also run a set of 1.12" torsion bars, magnumforce 2" drop spindles and late model 11.75" rotors in the front with stock calipers. I've had excellent support and performance from both the CAP and Magnumforce parts and companies. There is a member on here that had pretty extensive problems with a CAP tubular K-member, and I really can't comment on the K-member or the rack and pinion set up because I don't have one. But, the UCA's, LCA's and strut rods are quality pieces that have held up great for me for over 2K miles at this point, and I drive plenty of back roads, paved and unpaved, pretty aggressively.

I would stay away from rack and pinion set ups that use stock suspension mounting points/geometry (I know unisteer does, not sure if CAP does but they use all the other stock geometry so they might) as the stock geometry is difficult to set up with a rack without getting bump-steer. If you won't have room for a stock box though your options are definitely limited.