Personally, if you're not going to use it much, I'd opt for a corded drill vs. a cordless drill, and pick up an extension cord. Those cordless drills have a way of being left of the charger after the wife uses it, and 2 months later when you want it, the battery is dead. The corded drills are often a bit cheaper. I think I have 3 cordless drills & 1 corded, and the corded one gets just as much use as the others. I used to have a heavy duty drill that got a lot more use than the others, but it "vanished." - I wish I knew what happened to it.
Also, not necessarily a dremel as someone mentioned above, but there are a couple of knock-off brands that are similar. Sometimes around the holidays, you can find a kit with a billion attachments in it for a really good price (I got just such a kit at B.J.'s at christmas time 2 years ago) It's far from the most used tool, but every time I've used it, it was worth its weight in gold. Most recently, the bezel on the front of my fish/depth finder was crazed - it was useless during the day. If I didn't have that tool, I'd have spent a couple hundred dollars replacing that depth finder & never would have considered an attempted repair. I managed to cut through the face without going into the LCD, remove the front face, and custom cut a replacement all with that little tool. It's now better than when I first purchased it (used). There are tons of questionable repairs that owning such a tool changes your perspective on.
Other tools in addition to what's been mentioned - depending on your comfort level:
electrical tester
pipe wrenches (depending on the type of plumbing & gas lines in the house)
If you have kids and a wife willing to touch tools, the best way to purchase screwdrivers is to find the cheap ones at a hardward store - 50 cents or a dollar each, and buy about a half dozen each of slotted, #2 phillips, and #1 phillips.
I'd suggest 3 dozen of each, but that simply delays how long until the other household members will wait until they search for where the screwdrivers are put away. Sure, they may start in a tool box, but someone will leave it out and someone else will just toss it into the closest drawer. I'm convinced that drawers eat them, else they spontaneously vaporize after a length of time out of the tool box. I purchase another dozen or so about every other year.
Socket wrench set - you don't need the quality of craftsman, or the even better quality of snap-on, but stay away from the $10 sets. Some of the auto parts stores have decent sets for cheap. I believe Autozone (or Parts America?) carries Snap-on's generic brand. Excellent quality for cheap.
Cheap level - do it right the first time. If you have to drill 2 holes or pound 2 nails for a picture, hang a curtain rod, etc., it's much better to be absolutely sure it's level the first time, rather than eyeball it and discover you're off by only 1/4" later, but a noticeable 1/4".