SGC vs. PSA vs. BVG for card grading

[Rascal1010]

Thank you to all for your input through your replies in answering this question! In some cases the answers one seeks to a question only create more questions, this very well may be one of those situations! Though I love the sugestion of selectively damaging Mint cards exactly the same and sending to each grading company, I think a better test for my PC may be to grade a small sample of cards using the scale that I grade my cards with and send a small sample accross the grading spectrum to TPG's and I will go with the TPG that most closely correlates to my own grading standards.

Thanks again for all of the input, and THANK YOU for keeping the replies civil and not letting this thread turn into a PSA v. SGC v. BECKETT argument!