Yeah but if you don't want the OS, you can cancel and upgrade the Video Card or maybe add a SSD, but I suggest you buy the OS because I have a PC once without genuine OS and bang, everything messed up.
No. First, that Sabertooth is just nice looking, not really that pro in your mind. You don't need water cooling, I prefer air cooling. They are more easy and you don't need that for a gaming PC. Get 8GB is enough. That hard drive is a super overkill, downgrade and get a barracuda 500gb instead, or if you wanted to buy now then you can get the 1TB as newegg has a offered it from $109.99 to $49.99, super cheap! As you downgrade that hard drive, you can add a SSD for your OS, games and apps. You don't actually need a Blu-ray drive and Win 7 Ultimate (overkill), just get a DVD burner and a Home Premium. And that PSU, did you get it by filling up the budget? I LOLed with it hahahaha. Anyway, wait for a sec I rebuild for you. And ah, I think there is a bug on the Video Card, there isn't a price.
Yea, some parts were downgraded and some were upgraded based on gaming and your friend's preferences. He don't really need to fulfil $3500, with these specs, he can already buy 2! Or maybe he can save money to buy some donuts and coffees and share some for you and me hahah.