Attached Link: http://www.outbackphoto.com/the_bag/uwes_canon_lenses_2004/essay.html

Ok so I have an page her you should take a look they tested most of the used canon lenses. They really now what they are talking about. And I can speak from my lenses I have got the 70-200 f4L + 1,4 converter. It's really one of the best lenses. I also own the 50mm f1.4L wonderful lens, specially in low light. and the 100mm Macro is nearly a must have lens. For wide angles I would say a sigma lens is good enough. ( I'm using one until I get my new camera than I will buy the 24mm 1.4L USM. I mean there are some fantastic lenses from canon like the 85mm f1.2L USM or the 100mm f1.0L, but they are very expensive and if you buy a 20D you have a 1.6 converte already in there so the the two lenses aboth aren't tyhe best for portraits. For a very long lens you should think about the EF 100-400mm f/4.5-5.6L IS USM it's a great lens. And you are more flexible with taking pictures. (You have a range than from 160mm-640mm)