For a 750k, a Kerker will keep the center stand. Got mine from Dynoman Performance, but cheaper than what they're selling them for now, so look around. Low points of the Kerkers: not a sexy design and the muffler is ugly as sin (in my opinion), and you can't use the passenger pegs without some modification (there is a post somewhere about this mod).
I'll warn you though, I've heard a lot of people on the forum say the chrome is not the greatest quality (Kerker doesn't offer these in black anymore). Additionally, if you go with the Kerkers, the first thing you should do is CHECK THE FLARED PORTION of the header where it crushes the exhaust gasket. The flares on mine were all jagged, bent, and there was even some of the flare missing on one; no way was it going to make a seal. My replacement was perfect thanks to the good customer service though.
That muffler really has to go, at least for me...