Greetings! I just ordered a 21.5" iMac from the Apple Store and was wondering what cable(s) and adapter I would need in order to hook it up to two displays. The iMac has two Thunderbolt ports but do both support external monitors via the Mini Display Port to DVI dongles? Can I do one dongle to DVI, then use a DVI-dualDVI adapter so I can still have the second thunderbolt port open? Sorry if these are basic questions, but I couldn't find anything else online for the 21.5". Only the 27".