It's also worth mentioning that if your new trackpad doesn't click - there is a T6 torx adjustment screw located dead center of the bottom frame, below the battery (but not underneath it, so battery removal isn't required).

Turning this screw counterclockwise or clockwise will increase or decrease the travel of the trackpad clicking action. When i installed my replacement pad, it was not clicking at all - but turning this screw a bit counterclockwise fixed that problem!

It seems the advantage of going with the server edition is the higher storage space and faster CPU. however you miss out on the DVD player. How easily do you anticipate it would be to upgrade the CPU on the non-server edition?