I have been using this socket set for over 5 years :
http://www.harborfreight.com/10-piece-high-visibility-12-drive-metric-socket-set-67916.html
I have yet to find anything worthy of replacement? Why? Becaust they came in a black metal box that is easy to carry around in my tool bag. Everything else is either loose (socket rails suck as do magnets in the tool bag at the junkyard) or in blow mold casing (I always tend to lose them or the case breaks etc.) .
Trust me I have looked high and low and yet to find anything comparable in utility and better quality. I have driven over the sheet metal box, stood on it, laid on it, dropped it (sure my sockets fell out) but the cheap sheet metal makes it easy to bend back. Is it perfect or pretty? No. Is it utilitarian? EXTEREMELY.
My 1/2" socket driver is a Husky brand and I have abused it for the last 10 years.