If you want to look like a tacticaltoolbag, but want a tough fucking pair of glasses, go for a set of Revisions. They come in a variety of 'tactical' colors, too. What ever that means. http://www.revisioneyewear.com/hellfly.html
My freind was kind enough to step on them in full gear once, and they just got mushed to the side and scratched. And hes a big 'ol boss hoss.
I'll throw in another vote for RayBan Wayfarer...ripoffs. Buy about six pairs and bring 'em with you where ever you go. Trade them for shit, and keep extras. Plus, they look badass, and you wont look like a tacti-douche.http://www.impostercity.com/ImposterCit ... -4005.html
Either way, total cost ends up at about $120 no matter which route you take.