The magicforce 68 doesn't have too many owners yet so you won't hear as much feedback as on the Corsair K65.
The Corsair K65 can be bought at big box stores and has a very large user base. You actually have feedback all around, good and bad.
I prefer the magicforce due to its unique layout, and inexpensive price.
If you're looking for only one keyboard to ever buy, I'd go with the Corsair out of your two options.
If you're willing to look beyond those, I would recommend CoolerMaster Quick Fire Rapid. It will be cheaper than the Corsair and better in my opinion.