How to use an older iMac as the monitor for a Mac Pro

I'm setting up a new Mac Pro and want to use an older iMac as its display.  From what I've read this can only be done through Target Display Mode which means having to hit Command-F2 on the iMac to turn it into a monitor for the Mac Pro.  I can't see having to do this every time the user turns on the Mac Pro (daily).  Any other way to get this working or do I have to look for a monitor that supports Thunderbolt?
SAndrewsLGBTDirector of TechnologyAsked:
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Dr. KlahnPrincipal Software EngineerCommented:
Probably cheaper to buy any good LCD monitor without regard to whether it supports thunderbold, and then buy a thunderbold to HDMI converter off fleabay.

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SAndrewsLGBTDirector of TechnologyAuthor Commented:
Apple sucks LOL
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