Apple's prosumer/headless lineup has me scratching my head. There's the mini, which is a very nice little computer, maxing out at $1000 with integrated graphics. The next step up is the low-end Mac Pro with dual high-end radeons starting at $3000. There's nothing in between $1000 and $3000?
Personally, when I wanted a new work computer earlier this year (I'm a software engineer), I ended up buying parts and assembling it myself (runs Linux). The initial build was about $800 and surpassed the current Mac Mini in every single specification (except size, and arguably OS).
In fact, with the addition of a 256GB SSD (<$200), it approaches the specs of the low-end, $3000 Mac Pro. It has i7's instead of Xeons. (I'm not sure what the benefit of Xeon is on the desktop. I think of it as a data center chip.) I have one mid-range graphics card instead of 2 high ends. Are those differences worth $2000? Not even close, in my opinion.
For companies that are used to spending big bucks on hardware for very valuable tasks (high end graphics and video production, I guess), I'm sure they won't bat an eyelash at this. But for the average engineer or scientist working independently or at a small company?
The new Mac Pro looks great. I love the industrial design. I just hope Apple works their way back towards reasonable pricing for the prosumer market.