First and foremost, buy a Victorinox! I prefer the soldier model for daily chores, but if one is all you're going to be able to have for now, check out the 111mm locking blade models first. I always look for the most appropriate tools for what I expect the knife to do...cut, open cans and bottles, make holes in cardboard, plastic or leather, open wine bottles, and fix my damn reading glasses (spend the extra and get the little eyeglass screwdriver that twists into the corkscrew.) If the 111mm models are too big, check out the Huntsman model (91mm). Although the Huntsman doesn't have a locking blade, it does have a great assortment of really handy tools - all of the above plus a saw and scissors.