Hi MeAndMyKeys,
That's a bit of a difficult decision for you there. I have both a 16-voice Rev2 &, now, the Prophet-10. I spent some time today on the Rev2 and I must admit I'd find it hard to part with this just for the sheer joy of the amount of functionality this has over the Prophet-10, even with the option to use external sequencers and effects pedals on the Prophet-10.
Yes, I am loving the Prophet-10. It is a joy to play and sounds beautifully organic but for me its strength is as a synth for hands-on playing. From a purely personal perspective I would suggest this needs to be part of your decision process. If you enjoy the automation features of your existing hardware, e.g. onboard effects, sequencer or an arpeggiator, then you need to factor the lack of these on the Prophet-10 into your decision.