How can I find a weapon of choice for me in Modern Warfare 2?

Its really hard to find a gun that you are good with. Just try a few out, and whichever one you feel most comfortable with, and that you are good using, use it. I love shotgun running, and I also like a powerful gun, so I go with a UMP 45. combined with the Spas-12, it took me a while to find that these were a good pair. Just experiment with your favorite type of weapon, and combine it with a good secondary.