options for low profile railed gas block front sight?

[ssgrock3]

have a low railed gas block on Ar, now need a sight for it. Troy makes them, bcm and others, but where is the middle point of quality and cost. Back sight is a magpul, but they don't make one for low blocks.

 

[Gabriel42]

Midwest industries makes a few also Diamondback if I am thinking correctly