Actually I think SteavoBeavo's setup looks particularly good. As I said, my choice is down to replicating the look of my Battlefield 4 gaming setup...
I've got very nearly 50,000 in-game kills with the F2000 now, it's my favourite gun in the game. L85A2 comes in second, I'll have to get one of those eventually.
The 'Coyote' sight is often the player's choice of red dot in BF4 just because it has such a thin surround to the lens that it blocks less of the peripheral view than any of the other sights, and therefore gives a small (but useful) advantage.
My other fave in-game sight was the Kobra, but while the open T-reticle in the game looks nice, I found it doesn't encourage the same accuracy in aiming as a plain dot.
I'm lucky I bought the Kobra back when I first started airsoft, they seem to be super-expensive now.
Historical aside: I bought one of the early red dot sights, the SinglePoint, for my BSA Meteor when I was a kid. It was really designed for shotguns I think. There was no view through the tube, it was a massive red dot for the right eye, and you saw the target with your left. I could just about hit tin cans with it, but it was useless for an air rifle. Sent it back to the dealer.
https://shootery.blogspot.com/2010/07/moldy-oldie-review-singlepoint-sight.html
i forget that folk actually put protectors on their lenses.
unless it's a simple case of popping in a disc of polycarb into the existing housing i just run them plain and accept that at some point they're gonna get shot out.
I've got polycarb discs wedged into the front of my old Tasco scope, and my Kobra. Polycarb is pretty much unbreakable as I understand it, unlike the Lexan type sheet that gets used on the sacrificial lens protectors on eBay.