Hey Oli-
I think I met you at the Labor Day GTG - you're MM's girlfriend, right?
Anyway, as far as Lasik, I recall there being several threads about this in the past. Seems like some people have had good success with it. My sister (doesn't dive) also had Lasik done a couple years ago, and it turned out well for her.
I personally am interested in the general idea of not having to wear contacts again - but in actuality am really too nervous to do surgery on my eyes. I have read about the flip side of Lasik - when the surgery didn't go so well. I believe some people see weird halo type effects at night, or their nighttime vision is generally pretty bad. I think about the worst case scenario if the surgery didn't go right for me, and I decide that wearing my contacts isn't so bad.
There's a website that provides cautionary feedback on Lasik - I can't recall the name of the site, but I read about it on a past thread here on Scubaboard. It was a couple years back, though.