Invest heavy in the tools that you use most, ratchets, wrenches, sockets, extensions, pliers, side cutters, screwdrivers, torque wrench, impact gun with sockets and air ratchet.
Snap-On are very good tools but don't marry the Snap-On man, you will run into a problem at any dealer you work for its called the tool snob.
These are usually younger guys who married Snap-On and feel anything less is junk, don't buy into that mentality, buy high quality but buy what feels right in your hand.
My advise is to ask a few mechanics what they use and ask them if you can see how it feels, they wont have a problem with it as they love to show off their pride and joy.
You can get by with a Craftsman black box for now, IMHO better to have the best tools than the best box, the box wont earn you a single dime.
Buy American or German tools there are a few exceptions but in general stay clear of Chinese and for the most part Taiwanese stuff, OTC and Gear Wrench being an exception to some extent.
At this point Craftsman is off the list as far as quality tools go, i wouldn't bother.
Snap-On are great if you like the smooth chrome finish, i don't care for it, i prefer a blasted finishes and thin wrenches.
I know i have the "right tool" when it has the grab factor, meaning its the tool i grab without thinking about it.
One example is my 1/4 ratchet, no matter there are 5 to choose from all top shelf but this 25 yr old quick release round head from Ace hardware is the one i always grab it just "feels" right. I have the same in 3/8 and never touch it, that goes to the new Hazet which replaced the old Hazet only because it has quick release, otherwise its identical and 20 yrs newer.
Some brands that have done me right in the last 35 yrs.
Ratchets. Hazet, Stahlwille, Snap-on, Wright, Armstrong, Proto.
Sockets. Snap-On, Hazet, Dowidat, old Craftsman, Proto.
Pliers and cutter. Knipex, Klein.
Wrenches. Hazet, Snap-on. Both great quality i just love the feel and thinness of the Hazets.
Screwdrivers. Wiha, Witte, Hazet, old SK, some old Stanley.
Torque Wrenches. Stahlwille, CDI.
Air tools IR and CP, spray guns = SATA.
Micrometer and calipers. Starrett.
VOM. Old Fluke (many new are Chinese)