I use a Blackhawk SERPA and I love it. They make a left handed model for the P220, it is $47.00.
Here is a link to the SERPA page where you can plug in your info on your gun and choose the holster.
http://www.blackhawk.com/product1.asp?P=4105&C=C1387
I have been very happy with mine. I can highly recommend it.
As for a holster to use one all your guns, I wouldn't recommend that. Buy one for each that is made specifically for that gun. You'll get a much better fit and a much more secure holster to gun match. Anything that will work for several different models of guns will be a cheap, generic holster that isn't going to hold any of them securely.