I can make no reccomendations since I never payed more than $40 for a sight in my life. I always shot single pins and my favorite cost $12. I bought them four at a time and put them on all my bows. It was a crosshair inside a circle and I cannot recall the name. It worked superbly for me for more than a dozen years on a huge variety of game. I always bought the flourescent chartreuse color.
I can't fathom paying $100 for s single pin sight. For many years, I used nothing but a thin bolt. It worked as well as anything.
Check out the Classifieds on Archery Talk. You might find a deal on a more expensive sight. I sold a $150 Black Gold on there to a lucky buyer for $80.