I always thought this sight would look cool on the 97/97b
http://www.opticsplanet.net/burris-fastfire-w-picatinny-mount-4-moa-dot-mat-fastfire-sight.html
Compact, reliable, water-proof and great value for a real-steel sight. I'm not sure, but I think they use this sight in MW2, didn't liked the game, I barely play it, but it does look a lot like this one. The price might be kind of steep for Airsoft, but, judging by the reviews all over the net, I would say it worth it.
This might be another interesting option:
http://www.opticsplanet.com/reviews/reviews-yukon-sight