Here is what you need to think about.
Blitz Nur Spec = real loud, and has a rasp to it if I remember right. Don't try and think it will sound like a WRX.
Skunk2 ??? = Just say no. I have had the worst exp. with their products. :mad: on my Eclipse I had Skunk2 coilovers and the broke within 2 months. Then I called them back and asked for a refund or another set. I was told that I caused the damage and they could not do anything about it. :mad: But that is all IMO.
JIC sus505 = Love it. No rasp, deep growl when you get on it, almost silent at low RPMs.
Apexi N1 = Not sure but they sound hella nice RX7s and 240SXs.
HKS Dragger = Loud
GReddy EVO = One I had on my eclipse (V6) even though it is not a msp I can tell you it sounds bad ass, except it is very very loud.
Magnaflow street series = Same as the GReddy (my friend had it on his Eclipse GS (I4) )
Fujisudo =

great exhaust have heard it on some 350Zs and it almost made me wet my pants.
Okay, prob none of that helped but just some information I had picked up over the past few years.