Are the polls still open to vote for Wiha drivers? I'll add my ballot to their landslide victory regardless.
I got away with cheap drivers off auto parts store counters for years, but finally had a disaster that sent me scurrying to the keyboard to order Wihas. Replacing my third of fourth set of Griptilian scales, I tore up both my drivers and the body screws. I had to drill them out and wrecked the Noryl handle :grumpy:, but it was of little consequence as I have several sets of those hateful scales and don't anticipate selling my Grips anyway.

I'm just glad I didn't learn my lesson on something that mattered.
I'll also second the motion for a second set of drivers. I would suggest buying, 1) a set of the individual precision torx drivers, plus 2) a set of individual 1/4" hex-shank torx bits along with a fat, stubby bit-holder. That way you'll have that second set for knives that require two drivers the same size plus a more substantial tool that can help you loosen overly LocTited or torqued-down screws.
For lube, I'm a big NanoOil fan. A very little goes a long way and their applicators let you add just a tiny amount. Lots of knives come with too much grease that will never dry to lubricate properly. A drop of W5 or W10 to each side of the pivot will free up the action. A thorough disassembly, cleaning, re-lube is of course the better course given the time or opportunity. When doing so I'll usually put a little W85 in the pivot hole and W10 on the washers/bearings. For CRKs I've lately adopted my friend Anarchy85's method of W85 in the pivot hole and fluorinated grease on the washers. A tiny drop or dab of something in the detent-ball track goes a long way toward smoothing out the action for frame- or liner-locks. Just try to keep it off the lock-face.