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760 turbos have the 4-cyl turbo just like 740 Turbos, where as all other 760s have the PRV V6 (B280). I don't have any first hand experience with the V6, but I've heard that the newer V6's were not all that bad. They have a really bad rap because the older V6, (B28), had cam oiling problems which made them really awful in terms of long-term longevity. But that seems to have been worked out since the early 80s.
But if you are going to do repair work yourself and want to be certain of the engine's longevity, the 4-cyl is still probably a better bet. I say that mostly because they're much, much more common and they just don't seem to have many problems as long as it's the 8-valve head. Mine's been running wonderfully for 17 years and counting. (I think I'm a little biased on this issue.) There should be a lot of info in the 700/900 FAQ on both engines that you should probably look at.
Other than that, 700s and 900s are basically the same car. 760s have more electical gadgets than 740s, but they're about on par with most 940s.
Good luck with the hunt.
Tim
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Tim Smith '85 745GLE M46 w/86k
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