those knipex pliers work AWESOME for alignments, they also have a set out there just like that but they are more of a vise grip....
to tell you how much those things grip, i took a couple nuts and a bolt and threaded them all together and stuck them in a vise, then i grabbed it with the knipex "vise grip" and twisted the head off a 14mm bolt....thats impressive by all means
also, a set of tie rod tools if you work on dodges and older vehicles...
pitman arm puller, pickle forks, a good DVOM, a stethescope, radiator pressure tester, and lastly, a chunk of 2 inch diameter exhaust tubing about 2-3 feet long....makes for a good cheater bar
-Josh