exhaust upgrade

Hi , i have got a 83 GTi( DX engine) with a standard exhaust. i have got a good quality S/S 4 branch Manifold  2 inch diameter and want to
complete the system.  has anyone had any experiences with the following systems currently on sale on ebay?!
Sportex ,Jetex, Milltek.(or any other)
Advice Please! Not too loud !!
Dont want to Buy a Lemon!!

I have hung a couple of Jetex systems recently to DX GTi's and they have fitted like a  glove!