i voted for the delta flow w/custom bend. im a huge fan of the custom setup, but dont get mandrel bends - waste of money...actually, its a tremendous waste of money.
as for the delta flow, i like it a lil quieter - i hate all that damn racket exhaust makes. sometimes it sounds cool but i dont like it on my truck, i actually went thru 3 exhaust systems last summer then i went back to stock, cuz they were all too loud, but thats just my taste.