I am considering my options for my next camera. Trying to cover all the bases; I asked about the bridge cameras, so now I'm going to ask about pro SLR's. If I were to go with such a system, I would be considering a setup something like this. Canon 30D Canon 50mm f/1.4 USM Sigma 70-300 f/4-5.6 DG Macro Would the 50mm be enough for big landscape shots (Grand Canyon, Bryce Canyon, etc.), or should I consider something like a 26mm? Or maybe just a standard 18-55? Thanks.