Cost Calculator for hosting platforms

I'm thinking about creating a cost calculator for hosting platforms, and adding it here as a tutorial. Is there something similar already out there?

I want to compare costs:

1) running costs for different locations - particularly US v UK v EU

2) running costs for different DCs (within one location/country)

3) running costs per server

• compare new high spec server Vs cheap 2nd hand server (like ebay)
  • new servers use less power, but are expensive to buy
  • SAS v SATA v SSD

good idea? bad idea? waste of time?

I'm thinking that a LEB provider needs to get all these answers correct, otherwise they wont make a profit.