I am going on a trip of a lifetime round asia and oceania soon, so natrually I am taking my Eos 350D, I also have £150 knocking around which i have contemplated on buying a lense with. Trouble is I can't decide between a 50mm prime lense or a macro zoom lense around the 50 - 100 mm mark. I already have a 100-300 and the not particuarly amazing 18-55mm that came with the camera. Mainly I shall be takign outdoor shots of landscapes etc, but like the idea of a prime lense that can go down to F1.8. Any suggestions for lense choice, or equally well guides/tips/pointers for landscape photography.