Get a Beefy Bench Vise
A wimpy $30 vise may satisfy your wallet, but you'll regret buying one the first time you have to crank the bolts off a really big part. So skip the cheapies and invest in a heavy-duty vise. You want a vise with at least 5-1/2-in. jaws, a pipe clamping area, dual swivel locks and a large anvil area. I found this Masterforce model at a home center for $100. But you can find great deals on good used vises on Craigslist or at neighborhood garage sales.
Fast Tire Changes With an Electric Impact Wrench
In less time than it takes your air compressor to pump up to full pressure, you could remove the lug nuts from two wheels using an electric impact wrench. Sure, the electric models don't pack the same torque as an air-powered wrench, but you don't need that much torque just to remove lug nuts. If all you're doing is tire rotation and an occasional heavy-duty repair, an electric impact wrench is just the ticket (one choice is the DEWALT DW292 1/2-Inch 345-ft.-lb. Impact Wrench, available at home centers or amazon.com). Just make sure you use a hand-held torque wrench to tighten the lug nuts.
Save Your Back and Knees With a Rolling Seat
Find creeper seats at any auto parts store, home center or online tool site. The model shown here is the Sunex 8507 Creeper Seat. A unit with a pneumatic lift and a contoured seat (for you Ferrari owners) could set you back a little more.