Cable to connect old iMac as second screen for new iMac

Just bought the new iMac 27" with thunderbolt port.  I understand I can hook up my old iMac (24" Mid 2007) and use it as second monitor.  My challenge is confirming that, and then figuring out which cable to use. 
The manual says the old iMac has a "Mini-DVI video out port", making it sound like it won't accept input.  True?
If it will indeed accept input, what cable do I use to connect the two Macs?
If indeed I can't use the second iMac, I'll purchase a separate monitor.  What should I look for in monitors that will easily attach to the thunderbolt-only new iMac?  I won't be buying the Apple monitor.
Thanks for any help in advance.
Bob

Most new monitors will support standard DVI and VGA connections. Some may support Mini-DVI ports. That's about all I can tell you.
As for other factors I would look at monitor reviews - as many as you can - for the size and resolutions in which you are interested. There are a lot of products out there. You might try first doing a Google search to learn more about the meanings of the various specs the manufacturers provide so you might wade through the smoke and mirrors in search of meaningful information.

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