Video performance on external display

What Apple computer will perform the best on an external display?
I am using my Mac mainly for calibrated 1080p video playback.
I tend to come to the conclusion that I need a Mac pro for optimal performance on an external display? The mac mini could not produce flowing high bitrate 1080p video in iTunes. This was confirmed in an Apple shop. My iMac 27 inch i5 is perfect on the internal display but not external. And I read that the new Macbook pro is also better on internal than on external but perhaps good enough?
I go through all this trouble because as a video hobyist I am using a calibrated video beamer with my i1pro and found the cms that is supported on osx with the icc profiles very impressive. I need the cms because my beamer is a wide gamut beamer and uncalibrated the colors are to vivid. Using an external cms is expensive and difficult compared to the easy automated icc profile calibration in osx.

Hi,
I have tried several mkv's that I transcoded to iTunes with Quicktime. I used the fast option that only changes the container (save to film). The mkv's where like 16 GB perhaps not that high bitrates if you compare with DV?
But in the Apple store the quicktime demo's played good and the only explanation I can think of is the bitrate. On the internal display of my iMac they also played good. On the external display there where problems with 1080p24 and 1080p60. Only 1080i played good.
So I concluded that all my Mac's where to slow For my external 1080p beamer I even upgraded the memory of the mini to 4 GB with little result.
Do you still think that a faster disk might solve this problem? At this moment I am considering a Mac Pro or a Hackintosh.

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