I would get the thinnest lenses that you can afford. You will appreciate the reduced weight and improved appearance.
Hi,
I'm a fellow myopic from Germany.
I don't know whether you are a good candidate for LASIK. To my knowledge Lasik works for eyes up to -8 diopters.
I am wearing glasses with a small lens width of only 42 mm. The glass has a high index of 1.9 and I am very pleased with them. They are not thick at all.
(My prescription is OS -10,5D;cyl. -0,75D; OD -13,75D; cyl. -2,25D)
Here in Germany I got a pair of these lenses at 220 euros on the internet.(about 300 $)
Branded ones are much more expensive: Zeiss Lantal 1.9 or Rodenstock Rodalent.