I also recently switched from Nikon to Canon, and I am very happy the change. In the past I've owned the Nikon D90, D700, and D800....in my opinion the D800 is best for a studio environment with a tripod. The 5D MarkIII is a better all around camera and more fun to shoot with...my only complaint is I wish it had better dynamic range.
Also, Canon appears to offer more frequent, and better, discounts/rebates than Nikon offers.