I like the orange.

Personally, I would be cautious of being too matchy matchy. With only two colors this becomes a real possibility.

I would consider a third, small accent colour. Maybe white saddle and tape? What colour is the group you will be using. I think I missed that.

EDIT: I see it it Shimano so you have some grey in there to work with as well. I might look at the stem and seat post in tones more in line with the group set.

It will certainly be interesting to see the finished product.