I carry the sr9c with a Galco UDC (LH, I draw with my right), that I keep in the small of my back. Love it. If you want something for an ankle holster though I would not recommend it, unless you have really big ankles and don't mind walking with a limp . For an ankle carry I have a KelTec P-3AT.
I agree with Kras. For me the SR9c is too heavy for continuous ankle carry unless you wear boots that would allow the weight of the SR9c to rest on or in it. I will carry a Kel-Tec PF9 or my Airweight S&W .38 revolver in my ankle holster but anything larger is just to heavy for me. The heavier pistols like the SR9c always seem to find the boniest part of my ankle and make carrying there very uncomfortable.