Regarding the 650D:
"As far as competing against itself, Corsair's "evolution in reverse" continues. With the existence of the 500R, I have a hard time recommending end users spend up for the Graphite 600T or Obsidian 650D. Those are both fine cases, but honestly I feel like the 500R is simply a better performer. Your mileage may vary and you may find the aesthetics of the other two cases more your speed, but Corsair threatens to obsolete themselves with the 500R."
http://www.anandtech.com/show/4972/corsair-carbide-500r-a-corsair-in-every-home/7
"As far as competing against itself, Corsair's "evolution in reverse" continues. With the existence of the 500R, I have a hard time recommending end users spend up for the Graphite 600T or Obsidian 650D. Those are both fine cases, but honestly I feel like the 500R is simply a better performer. Your mileage may vary and you may find the aesthetics of the other two cases more your speed, but Corsair threatens to obsolete themselves with the 500R."
http://www.anandtech.com/show/4972/corsair-carbide-500r-a-corsair-in-every-home/7










