I bought a decent Sears starter kit and when I need something I dont have, I buy it, usually in a set (ie: offset wrenches). That way you wont get stuck with tools you wont use by bying the biggest set.
Also, if you decide to buy a Dremel, buy a DREMEL. Don't get stuck with a B&D Wizzard, as you cannot find a flexi shaft anywhere for it. Ask me how I know
. Don't get me wrong, I've had my wizzard for about 3 years and love it, but if I were to do it again..........
One last thing, Costco is your friend. They often have quality tools at very reasonable prices. Cresent wrenches, Vise Grip locking pliers. Watch out for the cheap stuff...they do sell that also. Stick with the names you know.