Tony -- On the recommendation of an old timer I got the Norseman SA-29 set in the round nylon case many years ago, A few have been replaced, and a few are getting short due to resharpening -- but it has been good value. Good steel and they are straight, well centered and cut-your-fingers sharp. 29 pieces from 1/16 through 1/2 by 64ths. Cost is in the neighborhood of $100. I do not regret it.
I have added the Letter set, but do not use it as often, but it has similar quality.
(Magnum is the black oxide coated -- good bits)
And yes I have a couple sets of cheap bits -- and got what I paid for them and use them in "throw-away" situations, but not for drilling close tolerances in valuable pens.