Replacing Upper Ball Joints

My left upper ball joint seems to have gone south on me, so I need to replace it. I looked on Rock Auto and there are a bunch of parts from different manufacturers, ranging in price from around $12 to $90. I've never worked on these things before and am clueless about which ones are good, etc. Here's the Rcok Auto link:
http://www.rockauto.com/catalog/raframecatalog.php
Can anyone give me some advice on how to proceed?
http://www.rockauto.com/catalog/raframecatalog.php
Can anyone give me some advice on how to proceed?
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