What style hanger/shackles do you guys recommend?

I am having the minitub done on my 72 Dart and the Hotchkis leafs installed. I am lloking at new shackles/hangers for the rear portion of the leafs and was curious as what all of you recommend. There is of course, the stock style hangers. And there is the offset style (I have seen a couple guys that like the placement of the .75" offset once minitub is done. And finally, I am considering billet aluminum ones from magnumforce, which include poly bushings and have a mid support (a little expensive $150 shipped).

The car is going to be 90% street car, with some amature autocross in its future. Is it worth it to go billet aluminum, or am I just liking them because they are billet?