Hey mate, Saved you a couple of Hundred, and explained some of the savings below: PCPartPicker part list / Price breakdown by merchant
No change to the CPU
The CPU cooler i've chosen will perform just as good as, if not better than the H60 in your build. It's got a chunky heatsink with some large, slower fans that'll move more than enough air to keep that thing cool. If you want something smaller and cheaper, go for the Coolermaster Hyper 212x, As most All in One Liquid coolers (Heavy emphasis here on the word most) will only outperform an air cooler of this size/ design with a 240mm+ Radiator and some good fans.
The motherboard is the same but has no USB3.1 Support, and therefore is about $50 cheaper.
The RAM was slightly cheaper, and is clocked at 1600mhz instead of 1866. This is obviously Slightly slower, but the difference is marginal.
The 840 EVO's had some firmware issues that caused them to slow down, and have obviously been succeeded by the 850 series. If you want a larger capacity for more regularly used games, you could get a 250GB or 500GB.
No change to the HDD.
The R9 290 is a very highly regarded card for high FPS gaming, and displays extremely well at 1080p. It'll run circles around your 750ti :)
The S340 is a simplistic, gorgeous case, like the 450D, but it's $60 Cheaper and has a handful of colours to choose from, if you want to build to a specific colour scheme.
I've opted with the 600w 80+ Bronze power supply, which will do more than enough for what you want it to, unless you want to add, say, another Graphics card, then you may need to upgrade.
Wireless card Unchanged
The monitor is cheaper, and is a very good monitor for Price/Performance. I myself own one and can say nothing bad of it, beautiful colours, fast refresh rate, easy to use menu's etc.
Keyboard unchanged.
Hope you like my build, the savings should let you play around with it and make some changes. Don't forget to include shipping, and Enjoy!