Looks like you've got the A1200 sorted.
As for the A2000, if you are on a budget, the Hydra Systems AmigaNet card works quite well:
http://amiga.resource.cx/exp/amiganet2000I'm using this on my A2000 & it works fine (cost $50 on eBay).
Mine needed an AUI transceiver like Tone mentioned (cost $4 on eBay).
PZ.