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CPU: AMD Athlon II X4 750K 3.4GHz Quad-Core Processor ($79.99 @ Amazon)
Motherboard: MSI FM2-A75MA-E35 Micro ATX FM2 Motherboard ($59.91 @ Amazon)
Memory: G.Skill Sniper 8GB (2 x 4GB) DDR3-1600 Memory ($52.99 @ Newegg)
Storage: Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive ($59.98 @ OutletPC)
Video Card: Gigabyte Radeon R9 270X 2GB Video Card ($199.99 @ Amazon)
Case: Fractal Design Core 1000 USB 3.0 MicroATX Mid Tower Case ($37.99 @ Microcenter)
Power Supply: Antec Neo Eco 620W 80+ Certified ATX Power Supply ($39.99 @ Newegg)
Total: $530.84
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2013-12-11 03:50 EST-0500)
I own the same motherboard, cpu, GTX 650, and 1 4gb stick of ram. I highly suggest going dual channel on the ram, and going with something better than the 650ti boost if you can (you say one thing but link another). I put in a different but similar case to show you more options either will suffice between mine or yours.
Just don't expect miracles out of the 750k, it will get the job done but not much else. Your limited by the lack of L3 cache, you can overclock it all you want but you will hit a point where it will become pointless as that will be the part that's holding it back (in terms of gaming and a few other things). But for the GPU's suggested I think it will do fine, just a heads up in case you wanted to drop in a very high end GPU in the build latter down the line.
Oh and use CPUID to get the CPU temps, most other programs report faulty temps I find. I tend to believe my 750k isn't running at -6celsius when being stress tested with 80 Fahrenheit ambient. It was a slight problem I've ran into.
And if you intend to ever overclock don't take the TDP of the APU lightly, I did and I am getting 70celsius while using prime95 with a CM hyper 101a (dual fan) with mx-2 thermal paste, compared to 82celsius with the stock heatsink/paste. This is in a Antec 900 with proper cable management and fans set to low. Reseated the heatsink a few times just to make sure, reapplied paste, etc. So my advice if your going to OC go with something with far more cooling potential like the 212 evo or better. (I wasn't even sure if I wanted to OC, and still don't know I just wanted to get rid of the stock heatsink and drop the temp so this will do for me.)