Add receiver/dryer to the list. If your system has been open, and it was if you know that you have no valve cores, you will need a new one.

Useful links:
A great forum: http://www.acsource.net/acforum/viewforum.php?f=1&sid=6c8a92f4dfb8cf7a5a5e1b587afb6e3f
Cheap A/C tools: http://www.thetoolwarehouse.net/shop/TTW14.html