It has to be between Ajmal, Swann, and Ashwin. In the times of greats these guys would probably be good bowlers. But given the dearth of quality spinners in the world, these guys stand out.
I find Australia's efforts with spinners very amusing. Nathan Lyon is probably their best option, yet they are stubborn about giving him a go in the shorter version. Michael Beer, Krejza, Doherty are all average spinners, i bet our guys are better. Now because they dont have proper spinners they are calling up a 42 year old Hogg.