So ENCO has a web deal on their 3in1 Model #300-0057 drill set which is a 135* Black Oxide coated "heavy duty" (oooooo, ahhhhh) set. Cheap as chips. Is there any reason I shouldn't buy this set? Are their other sources for cheaper sets or are there more limited sets that will cover the range of nearly all work? I'd love screw machine length drills but at $120 more for the set I can't justify it.