In my opinion the Victorinox Rambler can't be beat.
http://www.victorinox.com/product/1/100/1001/1109/0.6363

It's short, with two layers. You get both blade and scissors, both flat and Philips screwdrivers, bottle opener, nail file, tweezers and toothpick. For me it covers all the essentials, and doesn't have anything I don't use, so it has the best size-to-utility.

The scissors are small but good for cutting nails - better than the larger Leatherman scissors for that. The Philips screwdriver is also small, but again often fits better for small screws than a larger one. I carry a Leatherman Juice, but I still use the Vic Rambler.