This might show UK prices, but this is what I use and they're great - http://amzn.eu/3KKIv3e
An SSD will make a big difference in general, but loading times for maps and levels, large open world games etc. will all benefit from running on an SSD.
Just run Windows, plus your games on the SSD and anything like normal files, videos, music you just run on the larger HDD as the speed doesn't matter there.
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