What's the most durable low power scope (fixed 3x/4x, or a variable 1,2, or 3, to 7,8,9, or even 10) for under $1000? What I like so far is the Ta11 acog, and various 1-4's. But which make and model do you think is the most robust and durable scope? Also, keeping it around 16 oz if not lighter...