Genius Gone Insane
http://www.¯\(°_o)/¯.com
Good sounding room is the most important part. And yes good mics can help too... But no KM184's are going to save your ass if you are recording in a concrete basement with a low ceiling.
I did a quick, on-location session recently for some junior metalheads I know. I was terrified when I saw the room -- it was a garage with concrete floors but it actually ended up sounding pretty good. Maybe I lucked out with the placement or something but I think it was the ceiling. The roof had one of those A frames with lots of beams everywhere. Somehow the room mic even sounded good. Beams = good (at least in barbarian concrete garages).