are you looking for a v6 or v8? because the first couple you pposted were V-6s.
You'll regret getting a V-6...the one extra MPG you get is not worth losing the extra power you would get from the V8.
the last one you posted doesnt seem too bad. I would say check it out, and take someone who can give it a good look-over, with you.. And its still under 100k so its still under the coil recall/warranty or whatever you call it.
good luck.