On the issue of CoinCraft Desk vs. Rig. I'm pretty sure the Rig has a turbo mode too. It is just not advertised very well.

Off the website:

"the Rig can be configured to suit your hashing needs anywhere from 500 Gigahash/s up to an astonishing 2 Terahash/s.
Thanks to the proprietary PowerTune feature, boost the maximum mining speed with Turbo mode when the difficulty is low,
then turn it to powersaving mode to reduce the operational costs and extend its profitability life."

They don't post any numbers but I think it would be safe to assume that boost per GH you get from Turbo on the CoinCraft Desk
would be proportional to the boost you would get on the Rig.