I agree with you about Murray being a future #1. The only question is how good will Nadal get? He has potential to get a calender year Grand Slam this year. Obviously he's a god on clay, and he's the best on grass right now, Federer is next on grass. On hardcourt him, djokovic, and murray are on about the same level IMO. Federer is just a small step below.
Djokovic really been impressing me lately, it will be interesting to see how he does tomorrow. I'm absolutely shocked to see him at +600+ even with Nadal's dominance.