I was really surprised to find how much I didn't like the Space Grey iPad when I finally saw it. The colour works better on a phone IMO, though I bought the phone in gold.
So I guess my answer is that if I was going to buy the iPad Air (which I'm not because it's not unbelievably light compared to my iPad 2 nor does it feel much smaller), then the iPad that I would buy would be in silver and white, just like my 2 and my Mini.