The Steeda suspension was designed (and sold to Steeda) by a friend of mine. Its a GREAT suspension. I built my own t-arm/panhard suspension (check out my sig).
As for whats best, you decide. I personally like the 3-link, but you _really_ gotta know what you are doing to get it right. The t-arm/panhard is more forgiving. The parallel arms (sort'a a NASCAR) design are ok.
Its all up to you to decide, but make sure that they are STOUT pieces. I have seen too many catastrophic failures (I got lucky when mine broke) with nearly totalled vehicles.
Also, get a "package". Dont do GW arms and Steeda panhard and Griggs t-arm and... THey wont work correctly when all put together.
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Darius Rudis
Roadracer: Home built t-arm/panhard suspension powered by an S-trimmed motor :-)
My Mustang Page