Jim,
I'm currently running with a single disk as I was still in the evaluation phase.
When I looked around for GSXR 750 300 mm disks, there were only "premium" suppliers on the market.
The one I bought came from Metalgear. Very good but not cheap!
http://www.ebay.com/itm/251029211978?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649
I would have bought 310 mm disks but my calipers could only accomodate the 300 mm version...
That's when I discovered that while the fork stanchions are the same between models the calipers aren't!
I'm going to buy the gold valves but what's the rating of your springs?
John
With two 310mm rotors and an aftermarket brake master I have plenty of brakes but at the same time there is alot of travel in the handle. I like that as it gives me plenty of feel . It might be disconcerting to pull the brake when just standing still, but rest assured when moving the bike pulls down to a stop very quickly in response to my brake lever pressure.
I suspect you will get twice the travel out of your lever if you decide to add the other rotor.