The only problem with monitors is high dot pitch on CRTs causing blur or high response times on LCDs. I would suggest a 19" flat CRT for the ultimate gaming experience.
Also, as they have said above, get a better mobo than what you have selected. Go for the DFI, or an Abit or Asus mobo.
If you have the money, I would also maybe look into the 6800 GT instead of the 6600 GT. The 6600 GT is an awesome card, but games pretty soon will begin to stretch its limits, while the 6800 GT still has strong legs.