Fletcher peeps and G5's are good. My fav is the Specialty Archery Super Peep. You can change apertures, and I like that for hunting and playing around on 3d. Plus they make it in different angles for short or long axle to axle bows so you get the full field of view.

The key to good peep alignment is GOOD STRINGS and a tight d -loop made from good BCY material, not the camo loop material.