Side Pipes
I've got to agree, I think Hooker makes a superior product (I've got Super-Comps on mine), and from what I saw when I was considering a set, the Hookers are the way to go. My car currently has 3" pipes all the way out (with an "X" pipe) and it sounds BRUTAL, so I can't imagine how good it would sound with open side pipes. The thought makes me consider......The only reason I decided against them was because I a) didn't want to leave the gaping holes in the rear of my car, and b) I didn't want to fill the holes with patch panels.
I believe the length question is a matter of taste, and my taste tends to go towards the longer, thereby allowing the tip to be as near the front of the wheel arch as possible. I've seen shorter versions and the gap left between the outlet and the wheel well just doesn't appeal to me.
This is all IMHO.