Besides the soldering iron (I need a proper soldering station but I get by with my old Radio Shack iron pretty well), probably the helping hands get the most use.
Also jeweler's glasses (see my avatar). My eyes aren't really that bad but for smaller things and checking for solder gaps/bridges they are very useful.
Get a temperature controlled soldering station. The MPJA units are only $50 or so and work well.
I got tired of having to aim the swing arm lamps and installed a 2 x 4 foot 3 bulb florescent light fixture over the workbench. It is a nice commercial unit with a 6 inch tall grid to diffuse the light and prevent glare.
The bulb nearest the edge of the workbench was removed to reduce the light level to where I could my computer on the next table without going blind.