Help with my 15x10 ralley wheel idea...

I was thinking about going back to 15" stock ralley rims, however I'm thinking about getting the rears widened to 15x10. Can I do this with out my car being tubbed? the backspace should be about 5" if I'm correct? Has anyone done this? And what size tires were run?
If anyone has pictures that would be great too. I just think with that deep of rim it should look pretty bad ***! :)

Thanks!