Well, I was about to buy a Remus Sport based on sound and budget, then came across a used Eisenmann Sport for about the same price. I bought the Eisenmann and am pretty happy with it. Its a little to bassy at idle and low RPM, but overall nice sounds and very happy with it as a DD. I figured for what I paid, I could always sell it for what I bought it for if it doesnt work out.
If all else was equal: I would love the M Performance exhaust - however @ $4k its just waaay too much coin for me.
Thanks all for your help!