I have decided to get MBP sometime in mid February. I'd like to get Apple care support in it as well, because 1 year is just not enough. I'd like to upgrade the MBP to 4 GB RAM with non-apple RAM. The problem I'm facing is that I'm afraid that doin the upgrade myself would invalidate the apple care guarantee. Can any MBP UK owners tell me how this works and whether there is some kind of seal on the ram? Thank you very much for help.