I think it depends on the frequency you go out and shoot. Definitely Red has a better workflow (using less hard drive space is very appreciated over time) and the Dragon sensor does a really great job getting the image you want on the spot (MX sensor was tricky sometimes if you where shooting with little to no light equipment).
It is a good well-known rental camera. It pays over time and you have at least 2-3 years before it starts to feel left behind.
Blackmagic is cheaper, they are still on the learning curve with the sensor and they give you less time for you to get your money back before the next model arrives.
I think it can be a great camera for learning and/or a great camera for a small production company for the purpose of doing jobs without going to a camera rental.
I would definitely go one way or the other depending on the budget. It´s a good time to invest if you know what you are doing.
So I did a little list of Red accessories for Raven.
I own a Scarlet Dragon (Scarlet MX before that), so I spent some years trying to figure out what I need the most and what I don´t on a tight budget.
It should go like this:
Weapon Red Touch 4.7" LCD 1450 $US
Weapon Sidekick 1150 $US
Red Mini-mag 120gb 850 $US
Red Station Red Mini-mag 195 $US
Weapon Redvolt XL Module 1150 $US
Redvolt XL (2-pack) 675 $US
TOTAL 5470 $US
I would add the Dual Outrigger Handle (490 $US), because you need a good grip of the camera body.
So just to have the camera up & running you need a little over 6000 $US in accessories.
Red will have a camera package but I find them to have some items that you really don't need right away, adding more $ to the equation.
I really wish the camera body will cost basically the same as this list of accessories, that would be a good deal.
Hopefully there will be a medium/wide angle (something between 22-35mm) and we can have some nice comparisons with some cine lenses, which is what I´m most interested in. I saw some stuff with the Zeiss CP.2 and definitely the Otus are incredible. I would like to see them side by side with the Zeiss Super Speeds and the Standard Speeds, specially in natural light. I am still trying to decide between buying "old" PL glass or this when they become a set.