I always recommend the Beretta 92F. It is a fairly inexpensive (around $400 US), lightweight, high magazine capacity (15 rounds), inexpensive 9mm ammunition, and is very easy to handle.
Some people don't like it and prefer larger caliber/smaller magazine, but I like having more shots that I can control with a greater degree of accuracy; once you squeeze the trigger, you can't take the round back, you know?
The minstrel boy to the war is gone,
In the ranks of death ye will find him;
His father's sword he hath girded on,
And his wild harp slung behind him;
"Land of Song!" said the warrior bard,
"Tho' all the world betray thee,
One sword, at least, thy rights shall guard,
One faithful harp shall praise thee!