I would recommend Magnaflow. I have heard good things about Bassani but don't have any experience with them..
As far as MAC there stuff is great but definitely lacking in overall fit and finish for a show quality car. To be honest with you I didn't think BBK was much better and chose MAC headers because I could get ceramic (not that fake coating crap) for the same price.
Either MM&FF or 5.0 magazine had a comparo article in the last few months- best came out to Bassani's X-pipe with the hi-flow stainless substrate. VERY low restriction- single-digit if I recall correctly.
Depends on what money you're looking to spend, dude. If you happen to have a cash tree in your backyard, pick that sucker clean and make a phone call to Bassani. You'll pay a lot, but that thing will last a LONG time and sound excellent - all while keeping your HP loss to a minimum. I believe all of Bassani's stuff is stainless, too. I could be wrong though... not sure.
the new Bx line they came out with is aluminized, and definately more affordable (still expensive compared to some of the other brands though). However, all their other products are stainless.