In ideal world, data center upgrades would not only always be reasonably priced, but they would also be highly efficient. However, we're rarely given the luxury of having both.
In this economy, are you more inclined to buy equipment that is less expensive but perhaps not as power-efficient, higher-end, greener products that could save you money in the long run? What is your rationale for making that choice between power savings and price? What kind of analyses have you run to determine what would be best for you?