triumph thunderbits have gotten a fair amount of praise here. Snap-On slapped their name on them and charges twice as much so they cant be complete junk. Enco has a house brand thats USA made, also pretty decent and priced fair.
Preicion Twist is another brand to consider. Drill bits is one of those industries where there are only a handful of manufacturers left and a whole lot of rebranding going on so you have to dig through the BS.