is this worth 680$ (US)

aminal808

Reputable
Mar 9, 2014
21
0
4,510
so my friend is selling a system (used) two years old for 680$ is it worth buying and upgrading ?

case- carbide 500r
i5 2500k
4x4= 16gb Kingston DDR3-1600
z68 extreme 3 gen 3 mobo
seasonic x660 watt psu gold rated
1tb barracuda hdd
dvdrw samsung black
24' samsung syncmaster 2343

i was planning on just changing the gpu to something stronger and adding an ssd.
is this a good buy ?