forgueam, forgive me for beating around the bush and not answering the question you really asked, but there are some things to think about when outfitting yourself like this-- things like where are you going to put this tool kit, and what do you expect from it and from the new improved forgueam with a tool kit? Knowing where you're going to put it isn't unimportant- storage options vary widely from one vehicle to another, and you need something that'll fit the space available and still be easily available to use. Knowing what to expect from yourself and your tool kit may keep you out of some trouble. If there are specific tasks you know how to do, and expect to have to do, you may want the specific tools for those tasks-- things like changing a battery, for instance, or tightening a loose connection of some sort. Those tasks will vary based on the type of vehicle you're dealing with and the combination of your competence and confidence in dealing with it. I still see the old Ford tool kits around that you could fix just about anything that was liable to go wrong on your Model T or A, right by the side of the road.
You may be overlooking an opportunity here. Myself, I enjoy putting together a custom-made kit a lot more than letting someone do it for me, but finding good tools cheap at a pawnshop, used tool place, thrift store or flea market may not bring everyone the joy it brings me, and that's all right. Not everybody has my kind of time on their hands, either.
Something else to think about is what you expect from yourself once you've got your tool kit in your car. I don't know how many tools I've bought for no other reason than for the idea of the new improved me I'd be with this new tool, which I might use someday under some obscure circumstance. Sometimes I've surprised myself and actually used it. When it gets right down to it, though, if I've got a good stout screwdriver to use for all the things you're not supposed to do with it, a multi-bit screwdriver that'll fit the kinds of screws on my vehicle, a good pocketknife, a pair of channellocks big enough to hammer on item #1 if I need to, a crescent wrench, some wire cutters, and those specific tools for the specific tasks I expect, from experience, to need, I'm happy. As long as I've got a telescoping magnet and a hemostat to get the things I drop into inaccessible places. So good luck, and maybe somebody will provide with an actual answer to the question you asked!