I looked them up, it just depends. Do you want the one with all the bells and whistles for an extra $70 or would you rather save that and get K60 which probably performs pretty close to K70 just without some features.
Honestly $130 for a keyboard that thing should be QUALITY.
You could spend that $70 on a SSD for OS if you dont already have one.
or use that $70 to buy a sweet mouse to compliment the K70