Next upgrade?

[mercedes-benz]

For the person with no job, nothing else to spend money on, so I can do upgrade (then save for the next, so its a ongoing cycle)
(only 13 btw)

what would be a good upgrade for the below rig? (in my sig)

Currently I have some modding supplys and another 512 mb stick of ram coming.
After that arrives, what would you suggest I save up for for the next upgrade?

Thanks.