I have a canon rebel xsi - and I would like a macro lens and a great telephoto lens for really close up shots?

I have a canon rebel XSI eos 450D. I want a lens for macros, and a lens for telephoto close up, for example Birds high in the trees, Houses in the mountains, moon shots. I have a canon zoom lens ef 75-300 mm 1:4-5.6. what is reasonable to get?