stock F650GS - Desertwolf
The stock GS handquards will fit the CS, even though the dealership might not think so. The only draw back to the GS handguards on the CS is they hit the windshield\screen at full bar lock. This doesn't stop you from locking the bars as the handguards and shield give a little to allow lock.
Suzuki LTF guards: http://f650.com/phpBB3/viewtopic.php?t=207241&highlight=brake