2012 iMac 21.5 inch - dual external displays?

I bought myself a new 24" Asus 1920x1080 monitor for Christmas.  I did this in anticipation of buying a new Mac Mini when they were released this year.  Unfortunately I can't wait any longer for the Mac Mini.  I have a video editing job that I must start right away.  So I've decided to spend the extra money and buy a new 21.5 inch 2.7GHz iMac.  Here is my problem.  It is 2 inches too tall for the useful side of my desk.  It is also smaller than my Asus monitor.  So I really want to be able to use the Asus as my main workspace, and my 47" Samsung HDTV as the video display.  I know the iMac will only support 2 displays.  My question is, will it support 2 displays not including the built-in monitor.  I would like to buy 2 Thunderbolt to HDMI connectors and leave the iMac monitor black.  Will the iMac do that?  Also, the literature says it will only support a 30 inch external monitor.  I'm assuming that it won't care as long as the resolution is only 1920x1080, but is that a correct assumption?  I don't know what to do anymore.  I already have a MBP and I can't afford to spring for a second.  Ideally I'd love to wait for the new Mac Mini, but it's starting to look like it may not come out until the next generation of Intel chips are released, maybe not even this year.  I've already been waiting since last October.  If I can't turn the iMac monitor off, I may have to buy a new desk with more clearance.  Any help would be appreciated.  Also, just to make sure, FCP 7 will run on this iMac right?  I'm sure it will, but I can't wrap my head around FCPX and I want to avoid any nasty surprises.  Thanks.

I don't know which softwares you will use for video editing, but if I were you, I would buy the iMac 27" models instead of 21.5". It is because for 27" model, you can add RAM easily at the back of iMac. Therefore, you won't afraid for having not enough RAM. However, for 21.5" model, you cannot add RAM by yourself unless you are brave enough to remove the screen, which may damage other part of iMac.
If you have budget constraint, I will recommend you to choose the sixth choice. It is because video-editing depends on CPU, RAM and Display Card mainly, especially RAM, which I strongly suggest you to have at least 16 GB. For the CPU, the 3.1 GHz Qual Core i7 performs better than with i5-processor significantly. The i7 CPU has a technology which allows two threads to run simultaneously on each core, so a qual-core iMac has eight virtual cores.

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