aftermarket exhaust systems 197/200

i know its a subjective thing but i am after replacing my OEM exhaust for something that sounds and performs a little better.but purely road use. i am after a cat back, i dont want it too loud, just a little deeper in tone and maybe a few extra bhp. i would really appreciate people's experiences with quality, value for money, etc. so what do you think? akra. miltec , scorpion, Supersprint?
thanks
andrew
ps got it re mapped already by elite in leeds and cured flat spot, hopefully it wont come back after the new ex. goes on, i know, should have waited to do the map till after the exhaust....
 
thanks bud, hadnt come across the thread , there's ALOT of info there but with the the amount of cash involved i'll be checking it out, another reason this site is invaluable.:thumbup: