I'd go for the Gimsons GR02, they'll be much nicer than the cannibalized drill offerings, and quality wise wipe the floor with argos drills haha

Pros:
All metal gear box
Metal geabox casing
Accurate intergrated aluminium mounts
Motor better quality than super cheap drills
Motor guarenteed to not be directionally biased in speed/torq
Shaft has a better bearing

Semi Cons:
Shaft is a little long for my design, but it's not an issue if you have room for it