Unless you are really paranoid that something may break down, just get just about any brand, except the ones that seem like they haven't existed for like a year. Linksys, SMC, D-Link, Intel, 3Com, Netgear, they are all good. I don't know if ISA or PCI really matters, I have had no trouble with both of them in numerous systems. You don't need a fast NIC (100Mbps) since this is only for a DSL connection, so 10Mbps should be ok. I would say the max you should spend is about 18 dollars.