I really like the M1911A1, just for it's durability and stopping power. Not the most accurate of weapons, but like my uncle says (just some background, he served in the Army in Vietnam and teaches an M1911 course for law enforcement officers, so he may be a bit biased
), it's the AK47 of pistols, and for a CQB weapon, reliability and stopping power seem (to me, with my admitted lack of any real experience) to trump high accuracy and small caliber.