Which PC do I need? 7424/7336

Which one do I need to get? Are there major differences?
I was looking at this one
http://autogeek.net/hk7424.html

See this page:

http://www.coastaltool.com/cgi-bin/SoftCart.exe/a/port/skinny.htm?L+coastest+zqdg8549ffce8bce+1081421375