Thinking the same for when I get mine. Choices are Scorpion, Magnex, or Miltek. I always seem to end up with Magnex though.
Normally Magnex aren't too loud at all. On all three Mag systems I've had on other 16v vehicles I've even removed the smaller centre silencer, just leaving the one at the back, and it doesn't make much difference to noice, but a bit better engine response.