I would never, never buy no brand (or store brand) disc rotors and pads, and the TR650 is not a bike that really needs floating rotors. If you managed to run for 70000 with the original discs, that tells me that the original discs are the one to buy. Together with SBS pads (at least IMHO).
Arashi brake rotor up front. Its still early days and all is good. Arashi are better known for their wheel sets. http://www.cafehusky.com/threads/cush-drive-rubbers.88881/page-2#post-650046
I've considered replacing the front with a lighter one, probably floating as well. The stock ones are made by Sunstar (at least on my USA bike) and the front is quite heavy. I know the DOT has some funny requirements about rotors etc for certification so other market bikes might be different. But it works OK and not worn out so will probably stay on there until something doesn't work well.
