Im taking the D-Slr plunge shortly. Graduating from the S3is I think the usual path would be to pickup the kit lens (18-55is) and get another 55-200 for tele. What if I went with a single Canon 28-135is as my first lens to save money?? Im mostly into landscape and the occasional birding (will add a telephoto for this in the future). This way eventually I could work towards a 10-20 and 55-200 as time passes and my bank balance builds up. Will I be losing out a lot if I dont have an 18mm? Considering the max iv had before in P&S was 28... ?