$3,000 is a lot of coin. Have not heard the Mk6 but I know that many Oracle owners have reported excellent results by adding the Turbo Power supply. I would add that option first and evaluate the results.
Oracle MK VI upgrade
Has anyone upgraded their MK V to a VI? What benefits did you achieve? Oracle quoted separate prices for the MVSS ($800+120 installation), Bearing ($500), Delrin feet ($450) and Turbo power supply for $1,085.