I'm planning a vacation to Alaska. I have a Cannon Elan 7e with a 28- 135 IS and a 75 - 300 IS. I'm not a professional, but would like to get some nice wildlife and landscape shots. I'll be going to Denali, down to Glacier Bay, and then to Pack Creek for a day with the bears. I'm planning to shoot Provia 100, and Royal Gold 400 (unless I get any better suggestions). I'm also considering buying a teleconverter. The price for a Cannon 1.4 and 2x is the same. I know the 2x will get take me longer distances, but I imagine the quality will be less then with the 1.4. I don't know how to choose which one to get. I'd appreciate any advice. Thanks!