for a simple DSL connection, any cheap Linksys NIC would do the job. Would really dont need more...
If you want to run a server or a mission critical wks, you better look for a Intel Pro or Server. They do IPsec in hardware, have better management tools, more advanced options, and the server flavor is even able to do 3DES encryption in hardware Also, Compaq buy their network card from Intel and 3Com...