"the "old standby" powders for the .45 ACP and 9mm"
The classics would be 'Unique' and 'Bullseye', add one or more of the 'Dots' (Blue, Red & Green) for the 9s.
I much prefer 231/HP38 for both. Add a little Titegroup and you've got 9s, 38s, 40s and 45s covered. For bigger/heavier magnum rounds (357, 41, 44 and bigger), some 2400 is classic. I would go with 296/H110 just because.