Why are you buying more games/systems if you have games that you haven't played yet?
Do you guys all really complete every game before you buy a new one? I was expecting a bit more leniency in this area, especially considering that the stats on games that don't get finished is like 90%.
My system may not work for you. What I'm doing is trying to keep you from spending too much money all at once and ending up with a bloated collection full of games you've never played, which does you no good.
Play the game until you are tired?
Regardless, even if you don't do the "play first" thing, I still recommend following my guide and buying one game at a time, instead of all at once. This greatly reduces your risk of buying a game and never playing it.