hard question, I have used the falcon menace scopes with good results. You can find them used for 350-425. I like the ML16 reticle the best.
SWFA Riflescopes Falcon Menace Riflescopes
I have no expirance with Millet scopes but they are in that range and people seem to like them. they are second focal plane though, don,t know if that maters to you or not.
SWFA Riflescopes Millett Riflescopes Millett Tactical Riflescopes
I also have a SS scope, durable, great glass. this would be my first choice.
SWFA Riflescopes SWFA SS Rifle Scopes SWFA SS Scopes SWFA SS MRAD Scopes
Nikon, Leopold and Bushnell are solid choices too.
when picking a scope I determine what it needs to have and shop from there.
Low Light = 30mm tube and larger objective lens
Shooting multiple ranges = external turrets or bdc reticle
furthest distance / closest distance= power selection
I prefer some type of mill dot system.