Is this in a well lit area? If not, I have been experimenting with refective overlays and had great reviews. If you make all of your copy reflective, you will be getting calls for everyone to do it. Being a
Sign Co. is one thing, but standing out from your competition is another.
And I agree with all the other posters here: Use a website, not an email address. Dot coms are easier to remember. And put a tag line about the company. The Ph# might be too much for people to remember driving by, specially if you are in a multi area code market.
If you don't have your website up. Get it up with a construction page and all of your contact information and a hit counter so you can see what amount of traffic is being generated by your billboard. You will see that it will be worth spending a little time and money getting it up properly.
If it were my choice, I would go with the orginal "
Sign Rite" Copy layout. By making the name smaller and adding your dome stamp behind it gets too busy with everything else you have going on in the background.