If you're looking for a good 4MP pocket DSC, the LC70 is a great deal. While it can use MMC cards, I seldom see these larger than 16 MB. Their read / write speed is much slower so many features will not operate as quickly as they would with SD.
You don't need, nor do I see any real advantage using "faster" 10MB SD cards. With still images, 2 MB transfer rate is adequate, so the popular brand cards will work just fine.
I believe that comments from other people who have seen or used this camera would be worth considering.