Mini DisplayPort adapter? Any Solutions?

What do I need to setup two devices as secondary monitors from the iMac? Least complicated solution for have both a preview monitor and projector (running the same image) from the MiniDisplay Port.
Thanks for any input. Some colleagues purchased a Mid 2010 21.5" iMac as a Media Shout solution. Our workflow/line of devices now is:
iMac > Apple MiniDisplay to DVI adapter > DVI cable > Kramer VP Scaler/Switcher (DVI input) > VGA cable (only output) > Kramer 1:3 VGA Distribution Amplifier > Cable run to projectors (LC-XGC500L).
Problem is no preview monitor. Hoping to have the preview monitor prior to the Kramer so if there is a need to setup a different program or slide, we will be able to see what we are doing on the monitor, while the Kramer is set to black.
Trying to troubleshoot. If I split the Mini DisplayPort at the iMac to the Kramer and preview monitor, must they both be at the same resolution and Hz? I can't get both the projectors and monitor except the signal at the same time.
Again thanks for any input.

Called up AppleCare, they believe its a grounding issue. Naturally curious, and them having made it exceptionally easy to access, I opened up my notebook and found several issues with the placement of the motherboard. Firstly, some of the various spring-loaded grounding pins were unable to contact the bottom case. Also, the ground of the MiniDP was in direct contact with the upper case, rather than only touching its respective grounding spring. I suppose it must have been a problem with this running batch, but the problem was easily solved by loosening the motherboard, shifting its placement and closing it all up Another work-around I've found if nobody is so adventurous as to open up their case, just put the notebook to sleep, then plug in the adapter, then wake it back up :P

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<http://upload.wikimedia.org/wikipedia/commons/0/09/AppleDisplayConnector.jpg>
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<http://store.apple.com/us/product/M8661LL/B?fnode=MTY1NDA5OQ&mco=MTA4MzU1OTI>
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Message was edited by: dbmtx

Well, a bit confused here, maybe TB...
http://www.apple.com/thunderbolt/
19. How do I connect my Mini DisplayPort monitor or monitor using a Mini DisplayPort adapter to my Thunderbolt-equipped Mac when I have other Thunderbolt devices connected?
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http://support.apple.com/kb/HT5219?viewlocale=en_US#12

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There are NUMEROUS thread now about this in the Display forum, so please feel free to check them out. It's a bug that affects anybody with an external display. I'm hoping Apple fixes it soon....
http://discussions.apple.com/thread.jspa?threadID=1772394&tstart=0
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Mini DisplayPort adapter? Any Solutions?

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