The prices for the Port wine bottles on the window range from 9,95 to 245,00 euro! How to decide?
Olympus E-P2 + Panasonic Lumix 20/1.7
Well, whatever you decision, you will be paying too much. This is tourist trap and all the bottles are overpriced. The bright yellow labels should have made you suspicious. In Portugal, you will usually find the best deals on regular supermarkets.
Still on the subject of finding the appropriate format for one's work, I would like to call your attention to the work of Samuel Lugassy (interviewed in the August 2010 issue of Réponses Photo). This portrait series was made with an external flash during the early dawn hours in Lithuania's country side. He used a full frame DSLR and cropped the images to 4:5 ratio. The camera's display was partially covered with black tape, so he could preview the photos in the intended format.
In my humble opinion, for this work the choice of format couldn't be better. Beautiful stuff.