"This would amount to around 1.6tb storage then. I would need to buy a wireless ethernet card for the comp though. Would this be the best solution?"
Doing that would restrict the access speed to the drives to that of a wireless network connection. For large file transfers this might be frustratingly slow. Also bear in mind that, with a wireless connection, the router's bandwidth is shared by all devices that connect wirelessly, unlike wired connections where each enjoys the full speed of the router's network switch - 100Mbps (or 1000Mpbs with Gigabit).