Just a few things I noticed that you are missing...
First few are:
CD Drive
Rewritable CD Drive
DVD Drive
(those first three I would suggest only the last two, but if you can't get the DVD drive then get the first two)
You don't seem to have a floppy drive (You know just in case, I never use mine, but it's nice to have it just in case)
Next these things you don't need so much but are nice to have (They are needed to fully reach your inner gamer):
Liquid Coolent (Keeps things running at a nice cold temp)
UPS (Nice back up power supply in case your power goes out, gives you time to get the computer shut down properly)
LED lights (Don't all uber computers need LED lights?)
Network card (You may not have a network in your house but let me explain why this is a good idea, if you have an old computer you can put a network card in that then remove all the things that it no longer needs and take it down to the bare bones. You can then use your old computer as a file server to store movies, music, backups of documents, any other kind of file that is not a program. Also once you have an uber computer you are more likely to be invited to LAN parties, and to be able to attend one of those you NEED to have a net card in your computer)
That cool glove... let me find the link for it...
Ah here it is... go check out the
P5
And lastly, to become a true zen gamer you need to get
"The Journey to Wild Divine"
So if you don't have these things already you need to get them. (I need to get a few of them myself, like the glove. Going to wait on the liquid coolent and led lights until I get a new computer myself. This one is just to unuber for that.)