Based on previous VA's - Jon St. John has the best Omega voice in my opinion. I would like Omega to have a strong voice, but still with an emotionless personality. 

This supreme machine was built as the final and most powerful robot in Dr. Eggman's E-100 Series, and his wide arms are equipped with many concealed weapons. Angry that his maker shut him down before he could realize his great potential, he destroys all of Dr. Eggman's machinery to prove his ultimate power. He can be found in stand-by mode in Metropolis, and, if reawakened, will join and Sonic on his mission.