timmmay: I would stick with the default brand of memory, Corsair, it'll have been more tested. 8GB is good though. I guess it's a toss up between a 250GB Samsung 850 Pro, which is super super reliable, and the cheaper larger SSD. With the smaller SSD you'd want another hard disk I think. You might even get away with 120GB SSD, but might be pushing it with the sizes of games.
In my opinion I'd go for a larger SSD.
I had a 250gb OS ssd, but titanfall+ bf4 took 100gb alone (that is a disgrace those games are so big, i think they use uncompressed audio which takes up much of the space I read).
After installing the OS plus a couple of other applications and I'm bumping around 50-60gb free space which feels a bit tight. And, why does windows require a 16gb paging file if you have 16gb ram?
I'd go for double the space rather than a 10% or less performance boost.