Can you educate me on K5's? Buying first, 73-80 years

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Hey everyone just found this forum and love it. Im looking to buy my first K5 as a weekend toy to restore eventually and am finding all kinds of K5s from $1000 to $40,000. What years are most desireable between 1973-1980? What options are most desireable? I want to buy one that is a more desireable year with a couple of desireable options so when it comes time to resell it wont be hard when i get the itch for my next project.

That being said here is what I am finding.....As I weigh these against each other, what are some things to look for, and things to avoid other than rust?


These are all in the $5k range...

http://dallas.craigslist.org/ndf/cto/4727024249.html

http://dallas.craigslist.org/dal/cto/4749172517.html

http://www.cars.com/vehicledetail/de...15/overview/#_

http://www.cars.com/vehicledetail/de...9427/overview/

i really like this one, but it is double the price of these others, is it a decent price for what it is? What makes this one so much more valuable than the others?
http://austin.craigslist.org/cto/4693639169.html