Finger throttle ROCKS!!
Were talking thumb throttle (push) vs Finger Throttle (pull) I think all Seadoos come OEM with the thumb.
I bought the riva throttle and conversion kit used, didnt like how the plastic piece fit and took away my chrome so i kept the extensions and got a UMI throttle and just dremmeled a hole for the cable then filled it in with right stuff (black silicone).
I dont have any pics but its a clean look, My personal advice is go with the UMI and if you find some extensions get them too i cant stand driving my girlfriends RXT now that Im used to the wider grip