if i had to pick one manufacturer that i could only buy guns from it would be cz (and by extension now dan wesson) and second would be fn. cz makes my favorite pistols by a long shot, their rifles are superb, and so are the shotguns... though i'd prefer remington in the shotgun department. the vz 58 is a pretty awesome platform, but something a little more modular or 5.56 would be nice. revolvers would be slim pickings with them.
with fn, similar evaluation, sans the 5.56. love their pistols and rifles.
so, i'm not stuck on one company, but i tend to favor cz with pistols, and honorable mention to fn for the fnp/fnx and five seven.