Hi, In a month or so, im going on holiday to Greece with my wife and baby girl. I own a Canon 400d and im extremely new to photography. I had decided to try and learn a decent level of knowledge before i would start to buy accessories (lenses/filters and so on) because i really dont have the knowledge base yet to justify spending money on them. However, im under the impresion that buying a Circular polarizing filter would help my sunny greek landscape shots. (i intend to take lots) Is this the case, and are there any other accesories i should be thinking about?