computer for fsx?

Excellent choices.
Add a name brand 1,000w (or better) power supply to it.

I really need to make an actual account. The guest rigamarole is killing me.

Just had to throw a couple pieces of knowledge that I've acquired through my own building experiences.

~Don't get the 4GB 770 unless you are running multiple monitors, or using some oversized display like a HDTV. FSX won't utlize more than 2GB of VRAM on a single display.

~The Ivy Bridge is fine, you are correct in FSX being more CPU intensive. You picked a "K" series, so it would be in your best interest to pick up a water cooler to support the overclock if you desire to do so.

~You hardrive is a little short on capacity by modern standards, I understand it's a SSD, which is awesome, I preach the benefits of SSD's all day long, they're just too damn expensive. You may consider though, try getting a normal 7200 HDD to supplement it. A 1TB HDD is actually pretty inexpensive, and you can use it to store media and whatnot, saving the SDD for your OS and games like FSX.

~If Radeon is your flavor of choice, go for it. FSX will run Nvidia or Radeon equally. I just prefer Nvidia due to brand loyalty, and I find it easier to tweak.

I'm done, good luck.