How much should I pay for a KN7000.Can I get the proper SD cards for it or are they obselete too? The store here has SDHC cards, which someone said may not work in the 7000. I have the 6500 - does the same foot pedal work and will all my 6500 disks work on the 7000. Any advice appreciated ,Thank you. Cheers Jean Olivia. PS I am in Australia.