Galfer makes some nice rotors. I have them on my 06 and should be the same as your 01.
The front in a full float wave is DF677FLW for $189 and the rear is a solid wave DF678W for $139. A little steep in price but the front floating rotor feels great, rear about the same as stock.
I've never gone on Galfer's web site to see what bikes these fit but I'll have to try that out. (Gas Gas isn't listed on the site)