This is a topic that gets discussed regularly here. And I can't think of anything that can be said that hasn't already been said.
So before once again going down that very well trodden path, see this thread and the various links included in it: http://thefiringline.com/forums/showthread.php?t=452627
"It is long been a principle of ours that one is no more armed because he has possession of a firearm than he is a musician because he owns a piano. There is no point in having a gun if you are not capable of using it skillfully." -- Jeff Cooper