Here is a quick list of things I can think of off the top of my head:
Rolling tool chest (great for the pit and the shop)
Heavy duty air compressor (great for air tools and for a quick way to test pneumatics in a prototype capacity)
Air Riveter (much better than a manual one)
Nice set of assorted hand tools (never hurts to stock up on hand tools)
Bench top drill press (great for light duty jobs and the pit)
Belt/disc combo sander (much better than a grinder for handling a variety of materials)
Drill bits and saw blades (great way to stock up on spares)
If all else fails just wander the aisles of Home Depot until you find enough cool stuff to qualify for the discount
