I look at this two ways... ok more than that but here is what I mean.
These are tools that most of us, who do it professionally for a living, dont use them everyday. I have just about all of them listed in both Std and Metric. I have both the flare and open style in 3/8 drive that gets me up to 1" and 21mm.
I use the flared ones a whole lot more than I use the open ones, probably ten to one.
Then I have 1/2" drive, open style, that gets me up to 2 1/2" in Std and 50mm in Metric. Might use them once a month, but then you will get that one job in you will use multiple sizes for a couple of days straight so it varies.
I have a cheap set of angle wrenches in both Std. and Metric up to 1 1/4 and 24 or 27mm I cant remember exactly.
If this is for a home box, I would get onto something like Northern Tool and get what you need there because you will not be using them everyday and there is no sense in dropping several hundred dollars to buy something that you will not get the full benefit out of. For a 100 bucks you could get quite a bit of stuff on the list above.
If you are going with the good stuff, I would start with the flare style crowsfeet in 3/8" drive.