I have a 2011 17" MBP. I need to get a MiniDisplay(Thunderbolt) to DVI adapter. (Preferably one with a 6' cord.) I see these listed from <$5 to $30 for Apple's version. I have read that some of these will obstruct access to the FW800 port. This is a deal breaker. Can anyone with a 2011 MBP, tell me they have a MiniDisplay to DVI adapter that does not obstruct the FW800 port, and who the manufacturer is?