you can wait until it expires, however after the expiry date it enters a 60 day (from memory) redemption period where it cannot be re-registered by anyone except the original owner. after that time, it is fair game.
or you could get in touch with the owner of the domain and make them an offer.
get rid of the external drive and use it on something else (more ram, better cpu, an ssd perhaps?). also i prefer the 5750/5770 over the gts 250, it's only ~$30 more and far superior.
Go up the stairs near the pool tables at glasshouse and go left and walk down the little alleyway, or if you're out the front go down the alleyway between the tower and the radio station building/Co-op