Best way to accumulate tools is slowly. I started with hand me downs, then when money allowed got a 200pc set from Halfords, think it was 150 quid. Then over the space of about 4 years I got a tool chest and started to fill it. Think I paid around 30 quid a time when I visited Halfords buying a few tools.
I only use Halfords Advanced, which have dealt with some pretty heavy spannering over the years, and only ever broke the flat head screwdriver bits when I put them on a 18" knuckle bar with about 4ft of scaffolding on that to try and crack a screw... needless to say it didn't work.
But they are really good tools for what you pay for them.