One of the handiest things I carry is a 64-piece Husky tool set in a plastic case I got free with a tool chest purchase. It's a little limited in it's scope, but it's got 1/4 and 3/8" ratchets and sockets, a couple of extensions, and covers most metric and standard sizes. I carry a handful of ratcheting and combo wrenches and some sockets to compliment that kit, then screwdrivers, hacksaw, hammer, cordless drill, cordless impact, giant channel locks, drill bits, some fasteners, and about 50lbs of assorted other tools in a box strapped down. I'm working on condensing that, though. My problem is I don't like to be out on the trail, futzing with poorly-fitting tools or getting caught without something I need to fix a rig quickly. There's so much more I'd like to carry.
As to carrying cheap tools, ask yourself this: Would you rather have a nice wrench stolen, or not be able to fix a broken rig because your cheap wrench just broke or rounded off the head of a bolt?