Originally Posted by
urbanknight
The weight savings between 2x and 3x will be tiny... about 5g per wheel. I would personally just do 3x to make it match the rear aesthetically.
If you are going to match it, I would tend to agree with this, even though I stand by what I said above. It would probably look better to keep them the same, but I probably wouldn't have laced the rear that way instead of having changing the front to match.