Probably easier to decide on a particular brand of accessory, rather than looking in general. ie I like some side stand feet, but not all of them.But accessory sites in general:advdesigns.com (great guys, visited when I was in San Fran and fitted a few things)twistedthrottle.comtouratech.co.nz (it's obvious, but also expensive)In terms of brands, look at Altrider (especially crash bars and other heavy metal work - bash plates etc), SW-Motech, BDCW also makes heavy duty bash plates, Maier and MachineArtMoto make a lot of plastic stuff like mudguards and mudguard extenders.After 6 years my R1200GSA is a mish mash of brands 😀