I think that owning Snap-On shows to others pride in what you do. It's not that the other top name tool makers aren't any good, it's just that Snap-On has created that image and it has seeped out into the general public's concious.
Were it me, I'd buy Snap-On for the core tools, those you use every day, all day. For those tools you'll use once a day or less I'd look at the other brands.
Are you pursuing pure Repair Tech type work, or are you heading more towards fabrication? If more fab then you'll need to develop tool sources other than the traditional repair tool vendors. Some of my fab tools I've made, some have come from the machine shop industry, and others from garage sales and swap meets.
I use a large steel hand carriable box for my hand fab tools. Stuff like Tri-Squares, steel rules, scribes, center punches, "Dullies" (Sharpies- they're never sharp for long), dividers, transfer punches, T-dollys, etc.