adding textures to a level whats fastest?

I am going to build a level and it is to contain 6 512*512 textures what would be the best method

1. 6 sufaces and 6 brushes
2. 3 sufaces and 3 brushes containing 2 texture channels
3. tiling the 6 textures to a bigger image and using a single surface
4. seperate meshes for each texture (i know there are size limits to cards so this would be the safest)