$5000 to spend....

....Bad news is I got laid off... Good news is I got a nice check for unused vacation time. I'm putting most of it towards a rainy day, but if I were to spend $5000 of it on "improving" my system, how would it best be spent? Is there one component that should be upgraded? Or, should I divvy up the money and put it towards a couple of components? Of course, there are those 2003 Bordeaux and Sauternes futures to consider.. :-)