I'm about to embark on a little project. I'll get one box of Tactical Marines and one box of Chaos Marines and I'll build and paint each one up to a different 'Legion'. I put that in quotes because there will be 20 models, and two of the Legions are unknown, so I'll do Black Templar for the Space Marines and Crimson Slaughter for the Chaos Marines to round it out.
Has anyone ever done this before? It seems like a pretty fun way to practice painting, plus I'm hoping it'll help make a decision on which legion for 30k I'll end up doing.