I've had problems w/ low light in the past and am thinking of getting rid of my peep. When I spoke with the people at the local pro shop the showed me a few sights that excell in low light.

http://www.vitalbowgear.com/

Vital bow gear makes a number of sights (1,3 and 5 pin as well as pendulum sights) that have a yard of fiber optics per pin. They range between $69.00 and about $100.00 in price. Tom (the guy at the pro shop) said in summer he was shooting until after 9:00pm without any troubles seeing his pins.

Shop around and I'm sure you will find many high end sights that give you an advantage. Which one to pick just comes down to personal preference.