I'd suggest to test all the systems you can possibly put your hands on and evaluate which one suits your needs better. Image quality aside, everything else is extremely subjective and you'll find a million differing opinions on handling, software, etc... When making such a big investment, you can only rely on first-hand experience. Personally, after having rented and tested the two main contenders, PhaseOne and Hasselblad, I ended up investing in a H4D-40 system - for my needs it was the much better option. I shoot fashion, beauty and advertising and for that I find True Phocus invaluable. It's the only system that lets you shoot wide open and position the subject's eyes in the corner of the image and having them tack sharp in focus, nothing beats that. The IQ is amazing and the camera is actually usable in the 400-800 ASA range, which is a big bonus when shooting moving objects in available light. The grain at 400-800 is really pleasant and film-like, so sometimes I shoot at 400 ASA even in the studio, I love that feel of the file. Having only one battery to deal with is very convenient, too. The lenses are to die for - I have the 28, 80, 210 and 35-90 and I really couldn't wish for anything more quality-wise. Besides, there's a killer offer on the H4d-40 + 80mm kit now, you can grab a second lens for 50% off - get the 35-90 for half price and you'll be a very happy man, this has got to be the most amazing lens I've ever come across. As for Phocus - the latest releases are stable (and I'm a PC user!), no issues there. Raw processing is simple and the IQ is, ehm, wow. Phocus Mobile works as advertised, really comfy when you need that kind of thing. I think all the hype about C1 is a bit artificial - I don't really find any relevant differences between the two. I only have one problem with the system - being a PC user. Shooting tethered to a PC laptop is problematic, because of the small FireWire sockets that all PC laptops have - you have to use a FW800-to-small FW400 adapter which is really flimsy and the cable jiggles a lot, it's hard to keep in place even with gaffer tape, so you really have to pay attention not to move it at all once you've connected the camera to Phocus. Tried a few FW800-to-expresscard adapters, didn't work at all. This applies only to the laptops, the PC towers have big FW sockets so no issue there. That's the only thing I'd like to see changed in the Hassy - the next generation to be using USB3 and not the loathed FW. Fortunately, I hate shooting tethered and do it only when the clients insist, so I'm not really concerned with the issue
What else... Yep, you've also got the HTS option which is really nice for wicked portraits and fashion stuff. If money was no object, I'd get the H4D-60, but I couldn't really justify the huge price difference with the needs of my current clients, and the 40 is a bit faster, so I decided to get the entry level, start building the system up, and get a high-end body in the future, maybe after a generation or two of cameras.