I am new to digital SLR cameras and have been doing some research into the types of cameras and lenses I should get. I have pinpointed the camera that I think I'm going to go with, the Canon xsi, but I'm still up in the air about which lens(es) i should get with it. The place I am looking to get the camera from has a couple of packages: 1) includes the 28-300mm f/3.5-6.3 Auto Focus Lens; 2) includes the 28-80mm f/3.5-5.6 Aspherical Macro Mini Zoom Auto Focus Lens and the 75-300mm f/4.0-5.6 Auto Focus Macro lens. My question is regarding the pros/cons of the 'all-in-one lens' vs using two different lenses. Should I expect to see any difference in picture quality if use one set over the other for a similar application? Any other suggestions/recommendations will be well received.

Thanks for the help!