It was about 7 months ago when Scott Hanselman and CodingHorror built the Ultimate Developer Rig.
Let's see what the saving are for late adopters...
There is enough headroom now to pick up an extra 2GB of RAM and still put out less than $1500. I call this configuration the Ultimate Developer Rig +2***.
* Price includes mail-in rebate
** Drive is now deactivate, but comparable 500GB drives are still ~$120.00
*** Not to be confused with the Ultimate Rod of Dexterity +2 by you D&D nerds.