This is my current build:
http://pcpartpicker.com/p/wsgBBm (do note that W8.1 and a monitor are in that price)
I have a 780 ti SC edition, which is no longer available, so i placed a 970 in there. I'd recommend a 980 ti for sure, as it is a monster card. I'm actually unsure if it would fit into a 450D. I'd need to research that. The 970 should.
Overall your build is great. I prefer the Gaming 7 because I like the BIOS switch, the added PWM phases with Hi-C caps, the 8 USB 3.0 ports (versus 4), and the 8 SATA ports (which if you have a modular case like mine with hot swaps and you like to RAID a lot, it's awesome). However if you don't practice heavy OC, Gaming 5 is fine. Also, I am still on fan cooling, the Hyper 212 EVO has been in any build i've had for the past 5 years and has never failed me. I'd also consider more RAM. 8 Gigs is a rather small amount honestly, especially if you run a lot of background processes.
I was on a GIGABYTE board for the longest and I upgraded up to the Z97X a few months back because I managed to break my USB 3.0 headers and didn't feel like trying to weld new ones in. Meh.
TL;DR - great build, consider more RAM, stay i7