I'm still firmly committed to getting the 5D MKII when finances allow.
then please do not give it a try until you can afford it. Really is a different piece of kit from the 40D and you will want one straight away!
Just love mine. Some one says it can do video as well but i'm not that bothered!
Too late! I've already been bitten by that particular bug!
It's nice to have a goal to aim (or save) for.