I already have an OCZ 128gb Sata 3 SSD that I'm currently using and a DVD burner. I don't care about how the case looks. As long as it holds all of the parts and keeps everything as cool as possible, I'm happy.
go into the old rig and take out the i7 2600k. there is nearly no performance increase going to a 3770k. make sure that the CPU is a K model. if it isnt, go sell it on ebay and get a k chip since you cant overclock non-k chips. but either way it has tons of performance
and the fact that world of tanks isnt demanding questions me why you would want to upgrade at all