SSDs are great for bragging rights and WEI scores but really have very little impact in every day usage. Following tests were done on a 4770k box w/ 16 GB memory:
7200 rpm HD Boot Time = 21.6 seconds
7200 rpm SSHD Boot Time = 16.5 seconds
SSD Boot Time = 15.6 seconds
We also have 2 lappies, one with SSD + HD, one with SSHD ..... no one could tell the difference.
As for the cooler, if you are willing to spend $45 for the Xigmatek you should spend $60 for the Phanteks.....its 7 -10C better. If $45 is straining the budget, then get the $25 EVO, .... just remember .... it's "great budget" cooler .... that doesn't make it a "great cooler". If all you want is 4.0 Ghz, the 0.1 Ghz shouldn't bother the stock cooler. After all the 4790k goes to 4.4 Ghz on the stock cooler.
I saw the 280/2809x as the highlight of the R9 series but with the Asus 780 at $420 and dropping (I assume due to the rumored release of the 880) ..... I find 280x - 290x is harder to make a case for, especially if overclocking where the 780 tops the 290x (see 8:40 mark)
https://www.youtube.com/watch?v=djvZaHHU4I8
As for the PSU ....750 is good for two 280x's so I assume that's why ya went big
$75 after $20 MIR XFX Core Edition 750
http://www.newegg.com/Product/Product.aspx?Item=N82E16817207015