I'd say that 2.0 is the minimum. I ran 2.0, then 3.1 when it was available. For an ethernet card, your choices are slim. The best (only) one available for Zorro II is the X-Surf 2 but it's pricey. I still use an A2065 that is probably 10 years old now, but it works just fine. Check ebay and you can probably find one.