Damn, that's a good idea Monster - thing is, I'm off to the States next week and wont have time now, so I'll end up purchasing new lenses there. Good tip that though.
Oh, while I remember, don't get polarized lenses - can't remember the scientific reason. Something to do with image being distorted in certain circumstances. Also, if you plan to ever fly in a cockpit using any type of EFIS, black/grey lenses are best I think as they don't filter out colours that can appear on these units.
Blue