Regarding signals, I doubt you want flush mounts that can't be seen from various angles. The compromise is short-stalk signals and crash bars. I just installed these; they have a flexible rubber stalk and mount directly to the OEM hole. You will have to do your own wiring, but it's very easy.
http://www.stromtrooper.com/dl650-specific-wee-strom/65109-k9-turn-signal-my-06-a.html
http://www.stromtrooper.com/dl650-specific-wee-strom/65109-k9-turn-signal-my-06-a.html