I'd do Phase, for many reasons, not worth going into here, but suffice to say they appear to be tying something up with Mamiya, so if you know and like that system, then you're on the road already.
I'm on my second Phase back. no problems whatsoever to report after 3 years.
be sure to negotiate around a LOT. you can probably get far better deals than you are being offered, if you haggle with various dealers. both mine came from Capture Integration, who are excellent.
good luck