You guys could use the spreadsheet I made for Spiff to see if it's worthwhile.
Once you download it to your desktop, you may need to add an "x" at the end of "xls" for it to work, and you may need to enable editing. I had to remove the "x" for this site to recognize the format, or it wouldn't let me upload it.
The spreadsheet is in this thread:
http://ecomodder.com/forum/showthrea...eet-30022.html