Has anyone compiled a table, with a list of ATI cards sorted by their mining power, with NVIDIA cards aligned with their closest equivalent ATI ones in the table by their mining power, with the electricity consumption of each also included? (i would expect NVIDIA cards would be aligned with much weaker and cheaper ATI cards, it's my understanding that ATI's are optmized for the type of processing used in mining, while NVIDIA's are optmized for somthing else)
This isn't exactly what you're looking for, but it would be trivial to compare the two lists and align Nvidia with the equivalent AMD card.
Edit: Incidentally, AMD cards are optimised for integer processing (which is ideal for hashing), but Nvidia cards are optimised for floating-point processing.