Photo product reviews are invaluable to help assure your getting a quality product.
AMAZON The sheer number of user reviews makes Amazon a "must read". Whe you se mostly 5 Star reviews you can be quite sure of the product quality. In genreal, top quality items get many reviews.
Ken Rockwell Ken is an amazing resource. He is self supporting with his website, where he asks for contributions. If you find his advice valuable, PLEASE, by all means, contribute.