Get a 256 GB ssd, then you can put OS + a couple of games with all other applications installed in that drive itself, that is a huge performance boost. Games will load lot lot faster. Samsung Evo 850 is really good, another one to look for is Crucial MX300. Evo is a bit more faster, also has 5 years warranty compared to MX300's 3 years warranty. MX300 is said to be better value for money, better price/GB ratio. Both are well reputed SSD manufacturers.