I'd be looking at a Samsung Evo 850 1TB.
Looking at your motherboard i'd get the M2 variant of the MX300. Means you can do away with the SATA cable and power and move your drive onto a tidy slot on the motherboard.
Im using a Sandisk Ultra II 960gb drive for storage of games and some other programs when needed, and a Samsung 850 Evo on another PC for the same storage, no difference between them in real world performance , apart from cost per GB.
As great as Samsung may be, (though they conned me out of cashback when I bought my 840 pro), plenty of other SSD's do he job just as well.

So the Samsung Evo 850 1TB, yeah? Like someone else has said, I'll be looking to Black Friday
My 512GB Crucial MX100 has been faultless though, all the time I've had it. I've had Sammy's before mind, so I know where you're all coming from.
c.£300 now for the Evo so I'd expect at least 50 off in any sales?