Ok, so here's the problem. I want the Canon 50mm f1.8 lens. I want it very bad. But I can't afford it right now and probably also not in the nearest future. Yeah, even such a lens can be ahard to afford when you're a student living on your own. So I came up with the idea of getting rid of my 70-300 sigma since I only use it for macro shots with a close-up filter when I am bored. I don't think I need it's reach. And I think the extra speed and sharpness (in comparison to my kit lens) of the 50mm lens would come very handy. But then again, is it really all that sharp to make it worth selling the crap tele? I know it's me who should decide what's best for me, but some advices from more experienced photographers are always welcome. Oh, almost forgot, I've got an XTi with the 18-55mm kit lens.