From all the listings you can try Katerelos (3355.00 €) and Adorama (3215.00 €).
Adorama is cheaper, I think they import themselves so you don't get an official warranty; instead they offer a warranty themselves.
However you may want to go with the official warranty so Katerelos should be a better option.
Both stores are reputable and well-known; I have bought from Katerelos and was happy with them. Another option would be technixx (3269.00 €) which isn't in Athens but they will send from Thessaloniki charging a fee.
