If the guy is looking at a $100 scope, it seems that he probably doesn't have $350 for an IOR. I just got an IOR myself, really nice scope. Clear. The coating gives it this tint...but I expected that...
Anyhow,
For $100. I'd get that Wal-Mart Nikon. It's a 4x fixed. OR...you could go with Russian optics. There are a few VERY nice 4x or 6x scopes that aren't too big or heavy at around $100. And no, I'm not talking about those big bulky ugly one's that clamp onto an AK. Optics on some of these can rival much mroe expensive domestic scopes. But no one dares talk about that because it would mean we all spent too much on scopes...
Now...I'd push the spending limit up to $165 if I could and I would get the Burris 2-7x Ballistic Plex. Midway has these.
1] Burris is going to be tough as nails. All steel internals. Big bore guys love them for their ability to take massive recoil. If these guys like them and rave about them - they must be tough.
2] Glass is as good as Leupold and Nikon and others. I don't care what anyone says. Optics snobs are idiots, these scopes are great. I won't say better, but ever bit as good (compared to the equivalent model line)
3] Ballistic plex reticle is a poor-man's ACOG bullet drop compensator. It will do bullet-drop for out to 500 yards for .223. IT WORKS, and works well.
4] Is it short, light, and the best bang for the buck - period.
5] Unlike the Russian stuff, this will have a lifetime no-BS warranty.