You might want to also pick up Captain Marvel #25 through Captain Marvel #33 too. Starlin drew and also plotted a great deal of this classic story arc now known as "The Thanos War (Captain Marvel #25 through Captain Marvel #33) in those issues and they can still be had somewhat cheap. I can see them going up too.
Indy's CGC Gradings Master Thread - http://tinyurl.com/p45agbh
Want your Comic Graded or Pressed? - http://tinyurl.com/pn74odq
Notify you of new Gradings? - http://tinyurl.com/no58cku