LED M3s = vile...sorry bud, but most of these aftermarket type mirrors are dreadfully tacky. Best mirrors for the MK3 are facelift originals.....other than the fact they look the nicests, you can actually see out of them.
Anyway, at the end of the day it's your choice, but I'd never entertain having aftermarket mirrors other than Steinmentz/Irmscher types. Aftermarket mirrors look so cheap. Universal type fitment means they never sit at a very nice angle on the side or the car.