I had a discussion with one of my neighbors on what is a good all around rifle to own. I know there are a million options but I have found through my own experience it hard to go wrong with any of the AR-15 rifles out there.
The AR comes in many varieties the most common I see are the various M-4 clones. They are carbine length with collapsible stocks and removable carry handles.
I will later post some links to good AR information sites. Remenber rifles are offeensive weapons like Col Jeff Cooper used to say. Col. Cooper also used to say that the pistol was used so you can get back to your rifle.