Uncle Mikes are just generic nylon holsters. For pocket carry that is fine, for anything else, you want something tailored to your gun so it will be as secure as possible.
Also get something that is comfortable for you. If it isnt, you wont carry. I carry my P32 more then my G19, especially in the summer, as it gets hot. Heck I was just wading in the Gulf of Mexico, yes the Gulf, and still have my P32 in my pocket!
Another important thing that many people over look is the belt. You NEED a quality belt made for carrying a fire arm. These belts are more rigid, will not sag, and help distribute the weight of your weapon.