RE: What is a good brand of site?
It depends on what you plan to do with your bow.
For hunting, I like Copper John's Dead Nuts - good solid sight at a reasonable price. Other good brands are Spot Hogg, Carolina, Toxonics and several others.
For 3D - Copper John Dead Nuts Pro, Toxonics, Spot Hogg and others
For Target, SureLoc & Toxonics are my favorits.
There are a lot of sights available. You need to first decide on how you plan to use your bow and then make a selection based on that.
Hope this helps,
Allen