Blue Flame - stainless oval twin spout (good looking to my eyes).
About £170 max with link pipe; Road Legal and stamped - but 4 baffle/blank options giving varying depth and volume of exhaust note (and power? - not sure as I'm not really interested).
The don't seem really popular, but I've got them 3 bikes now and the one on my Aprilia RSV 1000 has been on for around 9 years and is still going strong.
All good IMHO and hard to beat for value.