I was NOT pleased with my original series X-Surf. It had some performance and reliability issues, to say the least. My advice would be to avoid this one. Mine caused mucho Zorro bus intererence, even before the ISA network card that is grafted onto it started malfunctioning.
The A2065 is a sound old workhorse, but you need an adaptor or 10-b-2 CoAx connection... This is the card I currently have in my A4000, though. It's cheap, fast (well, fast for 10mbit), reliable, and compatible. What I SHOULD have bought in the first place. I was worried that an old-school Zorro2 card designed for an A2000 might have problems on a SuperBuster-11 modern A4000, but it has behaved very well. Designed back in the "golden years" of Commodore. ;-)
I have heard good things about the Ariadne 2 and X-surf 2.... I haven't owned either one, myself, though, so I can't give a review.