First off, this is a real names forum, so please update your screen name. If you notice, all of these nice people who are answering your questions are using their real names, and we will appreciate if you will do the same.
As much as I find that DSLR's are a hassle to shoot with, DOF adapters were even worse. When the 5D mkII came out, I never looked back. Those adapters always had back-focus issues, there cumbersome, you have to keep replacing the batteries in them, you loose a good deal of light with them, the image shifts from time to time, and the list goes on. Granted, the EX1 hase a much better codec and audio options, but it's not enough for me to switch back. Hell, you can record to a Hyperdeck in ProRes from a D800 now anyway. On Dexter, they don't even use the external recorder.
If you're wondering if you can shoot on two or more different formats in one movie and not jar the audience, the quick answer to your question is: yes, they can be made to match in a way that is good enough. It's done in movies all of the time. However, you have to ask yourself a few questions: How good is your colorist? Does your DP know how to set the cameras up to get as close a match as possible? How much money and time do you have for post? Having said that, I would never use two different formats to shoot one scene. They will never cut seamlessly if you are going from face to face. It's not just resolution and colorspace, but you have to deal with contrast, tint, and a plethora of other issues.
If you you're working on a low budget, try rehearsing with your actors, and get the good improv stuff flushed out ahead of time. Also, if you get a good improv, you can always have them say that line again.