Cost me $750 to get formula-1 pipes for my GPX about 5 years ago now ($790-800ish including postage all up). They are a locally made product & looked pretty good too (
small pic,
big pic) and my one at least was able to work around the centrestand. From memory the megacycle one required the centrestand be removed, which kind of steered me away from them.
Best to figure out your pricerange and get pricelists and then email them & ask about what they can do for your bike, also if you go with their product you have a choice of a few cannisters to go with the headers & link pipe too, (p.s. they deal direct as well as going through dealers, my preference was direct as i was going to fit the things myself, i just didn't have the luxury of taking it back to a local bike shop for refund/repair if something stuffed up).