Hi from across the water over here we have three types of wrench, Lbs that is our old system or another name was Imperial, the next was in Kilograms , now we have Nw or newton meters. pain in the butt, everything on old bikes IE English/American was always in Lbs or rather Foot Lbs. So I have three modern wrenches, one that is a small wrench (I ues that for my gun stuff) small bolts or nuts that are delicate The other two just get bigger.
Personal choice get the most expensive with a great name that you can afford. I have used all my life either More & Wright or Starret, great American name that one. But these sort of tools have to be dead on, so like has been said Harbour Freight is a no no, get the best and don't believe all you read about snap on tools either, they rely on past achievements, some stuff okay, but they are way over priced and much isn't made in the states any more either.
So it comes down to how deep are your pockets. I think I paid about £60 for my smallest one, the biggest I have is a half inch connector I paid about £80 the in-between some where around that price too. But I bought mine starting with a 3/8th s square drive first. Then I went for the small one then the biggest. So but I bought mine over a 4 month period. Of course you can go the real pro route and get a Facom wrench the prices their go from about £140 up to over £400.00
Not much help but gives yo maybe an idea of what to buy. What I would say is that mine would be okay for me as they will out live me. If I had to make my living then Facom every time. :moped: