Shooting a white background instead of green screen?

Hi all, not been in these forums for a while, so hi :)

I'm going to be shooting green screen in the near future, I've done it before so I know how to do it properly. But the studio I'm looking to shoot has a much better white screen then green screen. It's got better lights, and a bigger space. So I'm looking now to film there, and key out the white.

My plan of action is;

1. Get the talent to wear mid grey clothing.
2. Make the white screen a stop brighter then the subject.
3. Make sure subject is not wearing white, or over exposed in any way.
4. Use After effects to either key the whites, or use a luma matte to get rid of the whites.

Is there anything I'm missing here? Should I try and use the green? Is there any really technical reason for using green that will effect the quality of my shots? Is white a bitch to key? Any other idea? Thanks guys, you all rock infinitely.