Buy your systems while you are young, working, and more than likely single.  I bought quite a bit with my wife, but she likes to watch movies too.  Now we are having a baby and let me tell you "Thank God I bought the stuff when I did!!!!"
Now we don\'t have to go to the movies because I have 100 inch screen with full surround, etc..  And I will always want to upgrade, but I don\'t have to.
We went to look at Day care for the baby yesterday and at 700 bucks a month my frivalous spending is almost out...  This blows..  This whole kid thing better be worth it...  That was a joke..  I know it will be worth it and I can\'t wait, but 700 bucks!!!!