I would definatey suggest the HKS silent hi-power!!
I've just literally had one of these fitted (last weekend) and am so so impressed.
The exhaust note is lovely, a bit of a rumble at low revs, then at cruising speed its nice and quiet.. give it some beans and the exhaust sounds ace!!
I would also suggest having a word with MikeGlanzaV at monster motorsport. The service I received there was brilliant and they are competitively priced.
Also another point to make quickly. Although all the pictures shown by the traders make the exhaust out to be stainless steel backbox only, mild steel from there back this isn't the case. HKS have revised the design and the system is now FULLY stainless steel.
PS Dan if you wanted to know what the system sounds like first hand, feel free to pop over at the weekend and i'll take you out for a quick spin so you can judge for yourself. Obviously mine is on an EP82 but there will be negligable difference in sound