Another thing to consider is *what* tools to buy first.
Had I to do it over again, I probably would get a good set of combo wrenches, probably either S-K Superkrome or Williams Supercombos.
Next, I would buy a good 1/2" drive ratchet (Kobalt for a budget?) and a breaker bar (a 18" Snappy is not that expensive used in the grand scheme of things) and some impact sockets. The Pittsburgh Pro sets in shallow and deep would be a good place to start. Why impacts? Because you'll want them someday, and there are only a few instances where you can use a chrome socket but not an impact; get the chrome ones later when your immediate tool needs have been met.
Then 1/4" and 3/8" ratchets and a complete set of 1/4" and 3/8" sockets, shallow and deep, buy 6 points first then buy 12 points if you have a need for them. Get a 1/4" spinner handle with a drive recess in the handle, very handy.
Then extensions, universals, etc.
Then get some line wrenches/flare nut wrenches/whatever. as I said before this is one tool where good quality matters. Snappy, S-K, or Mac.
Then it's time to decide if you want a bit driver or a real screwdriver set. I'm using a ratcheting Craftsman handle with bits (looks like the Snap-On one) because I'm under real space constraints for my tools and it takes up much less space than a full set of screwdrivers.
Also you will need pry bars, a ball pein hammer, an engineer's hammer, some Channellocks, Kliens, slip joints, side cutters, needlenose, etc.
If you're working on cars, I would also get the HF caliper service kit, and a Kastar/Lang ratcheting caliper press. HF lug nut sockets. Torque wrench from CDI or Precision Instruments.
here's a good thread about buying truck tool quality for cheaper
http://www.garagejournal.com/forum/showthread.php?t=136120
here's a thread I started regarding young pro mechanics but it may be worth a read for you as well.
http://www.garagejournal.com/forum/showthread.php?t=242021