What kinda work do you do on your car? A 12 point spline bit set would be a good addition.
Well I have only really got started doing things on my car.
To date have swapped cosmetic things like front/rear VW badges, debadged, changed aerial and fitted a GTI rear bumper. Have also replaced stereo, OEM intake, oil filter and spray painted alloys.
My next project is likely going to be replacing my brakes and PADS and taking the opportunity to spray my calipers. Have actually just seem the tool on Halfords for winding in Caliper but is a lot dearer on halfords than on ebay so don't think I will waste the money on Halfords one.