I'd say, if you want to do CGI, leave it for a version 2.

As for the lightsabers, I think the best route would be to give ALL the jedi in the PT blue lightsabers. Someone else said it first, but I'll repeat it here. I think it would add some really cool symbolism if all the jedi had blue lightsabers before Luke did, making the color of his saber sort of the indication of a new order. That way there's actually some meaning to the saber colors.

In addition, when you think about it, the fact that the jedi have sabers that are different, vibrant colors is sort of silly. It kind of makes the PT feel more like a cartoon.

Also, I've seen a yellow lightsaber before and they look a little strange.