So there were a few girls that had the same problem as me in finding a light gray suit or separates for your groom. My FI and I found the perfect separates on Jcrew.com and they are getting shipped soon. So if you are looking for a less formal option for your groom, check out their website.
As a side note, we found simple gray slacks for the groomsman at a Calvin Klein outlet for a good price (yay for President's Day sales)!