When I got my 40D, I passed the 400D that I was replacing onto my Dad. Then during the period I was first considering replacing the 40D, I was in a situation where I could have done with a second body and missed the shot because of it (I was looking at the 5D MkII by that time, but didn't fit in with my wildlife interests). I decided then, that I needed a second backup body. Eventually when the 7D arrived, I kept the 40D as a backup, until I decided to get the 5D MkII for landscape work. The 40D was originally a Canon refurb, which I was lucky and got for a good price, as a result, I only lost £42 on the resale, less than 10% of the original price. The 1D-X is appealing (although the cost isn't :p), but I'm not sure which body it would replace. The logical one would be the 7D in some ways, but I'd probably miss the extra reach, plus I'd probably lose less on the 5D MkII and it would give me more towards the 1D-X. It would be nice to get the 1D-X, but it wouldn't be for some time after its release, unless I win the lottery.