Share 'next purchase?'

I have been reading and going rounds with my next purchase of either a 5D mark II or a 7D. I have reviewed videos and articles but am not sure where to place my big purchase. I want to get a full frame eventually but I do landscape, wildlife and low light. I am aiming for night sky shots and sharper images. I also am trying to design my equipment to be versitle...That I can use my lenses on full…