I beleive the term that we should be using is "double stack."
Single Stack = One round on top of the other
Double Stack = Rounds alternate from side to side. Not truely two seperate stacks, but alternating about a third to a half cartridge diameter to the side
A 1911 (single stack) will have a magazine capacity of seven or eight rounds (I don't want to debate that all over again), and a 2011 (double stack) will have a capacity of 13 or 14 rounds.
All of that being said ...
If you don't like the 1911 I would not look at the 2011. You would probably want to look at Glock, M&P, XD or some similar design. They may all look similar, but the differences between them can be huge between shooters. Go to a gun shop and handle them. Then go to a range that rents guns and try them.
Good Luck!