Personally I've heard mixed reviews on the "Trashcan" a lot depends on what you are doing with it. If you are doing mostly spreadsheets and graphics documents with a little of GoPro video editing and basically light use for a MacPro then you could be fine with the "Trashcan". However for great speed and heavy video editing then the 5,1 MacPro is the undisputed king. Bang for buck you can get a 5,1 dual processor pretty cheap on eBay and then upgrade the crap out of it and still come under the $2600 dollar price tag of the "Trashcan" model you were looking at. Plus at the cost savings you could keep the 5,1 and then outright purchase the 7,1 when and if it comes available and keep the 5,1 and install a RAID card and turn it into a 6 bay NAS type machine. Personally I would stay away from the 27" iMacs due to thermal issues. I've had 2 and both have them have cooked the GPU even with running a fan program and have the fans running faster for better cooling. For the price of the video card (about 500 dollars) and me being lazy add the labor cost to replace it and it's cheaper to purchase a 5,1 MacPro which is just what I did. For 600 dollars I got a dual 2.4 GHZ quad core processor, 32GB of RAM, 256GB SSD with a 1Tb disc drive and the SuperDrive. For another 250 dollars I purchased a Mac version of the GTX680 video card. So for about 850 dollars I got a pretty decent machine for what I use it for. I have edited GoPro video with issues whatsoever.
I would stay away from the new MacMini because of thermal throttling issues. There are numerous videos on this on YouTube. There is a video where this uses one of those NUC computers and essentially makes a Hackintosh out of it pretty easily and it clearly out performed the new MacMini.
