Made the mistake of renting Forza 4.... I LOVE IT!
So scratching off Forza 3 from my buy list and adding Forza 4. Hopefully my tax refund (what's left after I pay off 2 large bills) will leave me just enough to get Forza 4, Skyrim, and Dead Island.
Forza 3 was really a great game but man Forza 4 is just amazing, I was shocked at how much better it was considering how good 3 was. Don't waste money renting it, just buy it!