I would only go with a auto darkening. After using one I would never go back to a flip down. I am with everybody else, try to buy a well known brand
Every one is right about buying a brand name like Huntsman or Jackson, but it depends on what type of welding you are going to do, you can get one that is mainly for tig,which is light weight,with good coverage, or you can get one for mig and tig, which is a little bit heavier and has a little more coverage, you can get a auto or one that you flip down by head movement or by hand.
But after 45+ yrs. of welding, I still like the non auto's better, I'll never use a auto - that's just me. Just find a good helmet and the correct shade lens. Of course the manuals are going to cost less than the autos [except for the cheapie autos] - but your eyes are worth the correct protection. It's your choice.