So I'm about to take the plunge and buy a used 1D MkllN and this got me looking at prices for the original 1D (the 1DMKI, not the MKII or IIN). My question is whether or not that would be a better 2nd body compared to the 30D that I already own or even a 50D. What interests me about the 1D is the weather sealing and what I assume is a better autofocusing system than either the 30 or 50D. I don't know if this is true or not and I'm finding it difficult to find any information on that. I know that the 50D has an improved autofocus system over the 30D, but I have no idea how that would compare to the 1D or how the 30D compares to the 1D. A 2nd body would mainly for used as a remote and also for use with a 2nd lens for field sports such as soccer, football etc. I shoot sports almost exclusively so please keep that in mind. I will also be upgrading to Canon L glass if that makes a difference as to whether or not the 1D would have a better autofocus than a 30 or 50D. The 50D interests me due to the improved high ISO performance. I don't know yet if that's worth upgrading my 30D to. The few samples I've seen have looked pretty good, but I'm still waiting for more people to test that out to be sure it's all that Canon claims it is. Having recently shot indoor soccer, this would be a valuable improvement if it pans out. I'd like to hear some specific pros and cons to the 1D. Particularly from anyone that has also used a 30D. I do plan on sticking with whatever I decide on for quite a while.