I am very thankful for you posting this: hats off - some nice licks in there.
I concur with the others: the Mark I has the best sound of the lot, and the Mark II close - I know they can be voiced to sound similar, but in this scenario the Mark I wins for my aesthetic.
I've continually been impressed with the Nord Stage - my gigging colleague uses one and we have used it here in the studio for tracking - I'm very impressed with it's emulations - from truly believable piano sounds, to the rhodes and wurli (even the clav!) sounding very, very close to the real thing.
I imagine the Mark 7 must play very nicely, tho I would really want to voice it more like the Mark I - something about the 'plastic' sound as it moves across the break into the upper register that just grates on me.
I need to get my Mark I back up to great playing/sounding condition: still looking to do the repairs myself, but sadly, I'll be waiting a very long time - a growing family means no time to rebuild that lovely axe...
cheers,