2013ish but really it's hardware from 2011! You could see an improvement in upgrading right about now.
Going to go ahead and throw my support behind @
Kostattoo suggestion.
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Miyagie, we like to post publicly here, so people can critique or show support for others' suggestions, simply posting that you sent the OP mail does not add anything to the discussion at hand.
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Hassliebe, I would say the only stuff you should really consider saving from the older build is maybe your graphics card... but honestly your budget allows for a near full overhaul, which you could definitely benefit from... Your hard drives/Solid state drives are all small/old... new ones of either variety will be much better! ADATA is not a favored SSD brand for pretty much anyone on these forums, to be fair. Kos recommended a Crucial SSD, which I will fully support! I have four and none have failed me, all are tanks! 8)