I would hope you can get all the used sheetmetal for that car for $250 or so. I don't think I'd bother with a used radiator. They are rarely any good. Buy new.
Also I would not count on getting any usable lights in the junkyard, but there are some good deals out there on Ebay and the usual online companies. You may or may not be able to find a usable grille in the junkyard. Note that if you find or have to order lights for this car, they are different for a 700 with fog lights vs. without.

If the junkyard says they want $400 or more, you'd probably be better off finding a junk V6 car or another 760T with a fried engine and just pulling what you need off of it. They're cheap enough now that this might be the way to go. That way you'd probably get 95% of what you need in usable parts from one car and not have to spend a lot of time searching.

Good luck!
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Rob Bareiss, New London CT ::: "Roterande Fläkt Och Drivremmar!"