Never can have enough hand tools, except when you have to dig thru all of them to find the one wrench you are looking for....
This is only one of the reasons that I ask my brother in law to bring his equipment to my house to wrench on it. His meager assortment of tools are jumbled together in ammo cans, boxes and bags and never a complete set of anything including combo wrenches. I keep my tools well organized and in a specific spot in my tool boxes so that I can instruct anyone on how to find a certain tool. Mostly I do this so that I can find them (early Alzheimer's or the CRS syndrome you know).
I have collected tools for many years and have assortment of brands from Proto, Craftsman, Harbor Freight, etc. Due to the CRS, I have 3 sets of metric ratcheting combo wrenches and non in SAE. They are pretty much useless anyway since the housing is so thick that it wont go on most nuts that a normal combo wrench fits easily.
I do find that the 3/4 drive socket sets from HF are very useful and even when used in my HF 3/4 drive impact gun, they have held up. I got a set of them in SAE and Metric several years ago when they went on sale for around $60 each IIRC. I don't need them much but when I do they are a life saver.
One thing I had to go buy from Auto Zone was a hex head socket to fit the oil drain on my LS tractor. I just didn't have any Allen wrenches nearly big enough to fit that bolt. I think it was 17 mm or 19mm, very large in any case and **** for tight.
Another thing I have found many uses for is the HF security bit set. With all the different screws in use, I find this little set to be invaluable.