Front suspension options

Ok, what front suspension options are possible (not necessarily available) for our A-bodies? I know there is various forms of the factory suspension from bone stock to tubular control arms w/coilover conversions. Then, there is Magnum Force and the HDK bolt-in K-members with their aftermarket suspension.

I would love more room for headers, oil pan, and starter RnR by ditching the torsion bars and rear steer linkage but I don't have an extra $2500+ for the HDK option. Are there any other options? Anyone tried something from another vehicle adapted to work on an A-body?