I keep a Vaco tool roll and a set of Torx inserts for a 1/4" socket right by the computer at all times. The Vaco has a handle, an extension, and about a dozen tools, six socket heads, three sizes of phillips and of flat head screwdrivers and the Torx bits fit in the 1/4" socket head. For most things that is all that is needed and the two items don't cost much. Tweezers are nice to pick up the nuts you always drop where you can't reach them. I also keep an Erem 13EB offset long nose tip cutters at hand for putting on and taking off the jumpers on MBs, HDs etc. A miniature Maglight and a 4" hand magnifier finishes out my survival kit.
Your comment suggests that you want something better than this survival kit. Check the CyberGuys catalog on pages 24 and 25. they have some computer tool kits that will make your mouth water at very reasonable prices. No kit will include the Erem 13EB long nose tip cutters. Those you will want to get separately.