A "Hollow Torx" (size 10) bit does the trick. That set Necromancer posted has it in there, among others, and really is a good variety set. I bought a set a few years back and now wonder how I ever did without them.
As per that soldering iron - for general everyday pcb work I'd recommend a 15W iron. A 30W will be nice to have when you need more heat to work on larger components though.