As I recently got my Mac Pro I was curious what the consensus is on purchasing Apple Care, I plan on upgrading the CPU and GPU later on down the line, I know I will need to retain the original processor tray when I turn it in for warranty. However is it worth it for things like the logic board and PSU or is it very rare/cheap to replace these items as needed? I'm very hardware literate so replacing things is not the issue it is simply the parts that i am worried might be hard to come by and very expensive versus the cost of Apple Care. Any guidance with cost examples would be awesome, thanks in advance. Also where is a cheap place to buy just a 12 processor tray later on down the road? It seems like I can slide the puppy right in and be ready to go since they are all 1366 chip sets. I bought a single processor Mac Pro that is my reason for one day wanting to buy a new tray, OWC offers the upgrade but they keep my old tray, this is not an option for me.