I suppose the € 300 / $ 300 difference(seems to be the same calculation in the Netherlands) is down to 3Gb, HDMI, HD-SDI 2k and 4:4:4 processing.
I suppose the 4:4:4 processing allows for better quality previewing when using an HD monitor with HD-SDI in.
I'm guessing the 2K support is for exporting, not for previewing purposses.
I'm considering buying the decklink studio or the decklink HD extreme. I just bought an SD monitor with component videoboard for previewing purposses of MXF HD footage. (downscalable to SD by the deckink) I suppose this is enough when adjusting colour etc.
I might start using HD previewing in the near future, so I'm not sure as to if I should buy the studio or the hd extreme. Any advice?