When I started as a line mechanic back in the 70's I bough mostly Snap-On tools. They are excellent quality, and they financed them as well.
In the late 70's, my shop was robbed and most of my hand tools were stolen. The shop owner gave me a "dollar amount" settlement and I went to Sears and replaced all I had lost and much more!
Craftsman (as has been said already, NOT SEARS BRAND) is a great choice. Quality is as good or better than Snap-On, MAC, Stanley etc, with a great warranty.
If a Craftsman tool fails, you can replace it as soon as you get to a Sears store. If a Snap-On tool fails (and they do) you have to wait until the driver runs his route!
Cost wise, Craftsman is usually much cheaper than the tool truck too! I believe also that K-Mart, and ACE hardware have started selling the Craftsman bran as well.
My favorite ratchet though (3/8" drive) is a Sparta offset "broke back" that I bought at NAPA. Once it breaks loose the bolt or nut, it kind of turns into a speed handle!
A good place to find tools is at flea markets and yard sales. Buy the Craftsman stuff and if it is rusty, worn or such take it to any Sears store and replace it!