@Paradox
This is a nice build, but I suggest taking a 3570K, it doesn't cost much more than the 2500K (at least not in Croatia).
The GTX 570 also offers by far better performance than the 560 Ti, even though it does a few extra dollars.
The SSD is to install applications/games on it, it's like a nexternal HDD or something, I've never actually used it.
I also suggest buying a cooler.
If you can expand your budget anyhow, make sure to change that 620W into 700W, in case you buy and extra GPU or something later.