What body are you looking at?
Hey
I am looking at getting the 5D in the feature. As for now I just have an Xti.
basically you have no glass. nada. Forget the body for now. You won't see any worthwhile improvements. Think GLASS and LIGHT. Get a 580EX II or at least a 430EX. get a 50mm f/1.4 if you want a portrait lens. Get the 24-70 f/2.8 L if you want a brick to intimidate your subjects :P. Get a 85mm f/1.8. or a 70-200. Anything is better then a new body at this point given your current kit.
Hey
When I get my lens I am really getting the 580 ex as well to... One question would my dad's spare nikon flashguns work with 580 as a slave?
Glass won the argument with me also. I was thinking of either a new 5D or the 85L f/1.2, and the new lens won (expecting it on Monday woohoo!) and early next year I will consider purchasing the 5D.
Hey
You must be so excited in getting that lens. Maybe I would do that too and make the body go on later on
Have you considered the 24-105L IS? Its in the same price range as the other two and would give you a longer zoom range, especially if you are interested in more portrait stuff, but you would have to be willing to forgo the 17-23mm range... but hey alot of people still shoot 28mm (on the wide end) lenses on their crop bodies, i did for a long time, didn't hurt too bad
Yeah I have compared them. But I like the 2.8 more 
Cheers



