as you "grow" a good set of crowsfeet are great for things like transmission cooler lines, brake lines etc - I like SK's version because the grab more corners of the nut
breaker bar for 1/2" sockets (handy for the obvious and breaking loose lug nuts)
eventually you will find out that you will need a couple of torque wrenches - you'll need a narrow / low range (transmission pan/gasket for example is only 8nm) somewhere between 8-30 and a regular range (30 - 120 nm) - I think lug nuts are 80lb or 100NM, and rarely do you need anything godzilla - but it happens (lower control arm eccentric bolt I think is 180nm, pit arm rebuild is real high as well as idle arm)
what else
varying rang of rubber mallets to kindle break things loose (rotor stuck to hub for example)
prybars - assortment - definately come in handy
set of punches - as someone mentioned - for breaks, and helping line stuff up (like the upper control arms
for that dang top bolt
floor jacks, zip ties, cable cutter pliers
very advanced (not cheap), but saved my rear a couple of times to clean up bolts and bolt holes - metric tap and die set
the basic metric set of 3/8" 1/2" deep and shallow sockets with ratchets and varies extensions will take you a loooong way!