another point to be made is the comfort and fit of the tool. If for example you are using the old style of craftsman wrench a lot you get hand fatigue. Snapon spent a bunch of money in tool design slim as possible but comfortable to use all day long.
If I was starting out with little or no money (hey thats still me) I would talk to the guys doing the specific jobs that you will be doing and find out what the bread butter tools are. What you must absolutely have, then spend the money for snapon or equivelant on those tools. Where some get in trouble with their monthly tool bill is they buy every new thing that comes along. A little thinkin can most times solve the problem with basic tools not the latest and greatest high dollar tool truck tool.