I am still kicking myself for selling my old X-Surf card! Theses network cards are VERY hard to find. I wish you luck. I wish I had one for my 2000HD!
I sold an X-Surf II last year, and I keep my 3cc on-hand for potential future uses (or extortion-rate sale price

I went USB on my 4000D and it's fan-bloody-tastic.