Out of the three lap capable gaming keyboards out now, the Razer Turret is the only other one that is somewhat competitive, and more compact, both a bonus, and a negative since the mousepad is tiny and the mouse itself is a small mobile sized one which is fine, but might not be the best for extended play.
The corsair one doesn't have a wrist rest which makes it a pain to use for extended periods of time. The Roccat is pretty much the best choice and at $200, you're getting the mouse for free.