Very interesting Dllyod, I didn't know there were other Ft232's that would do that, I may have to give that a shot.
It's becoming more apparent that having an SD card for data logging purposes as well as storing the source code. Are there SD card controllers? Something to use rather than having a large library for SD card interface on the uC? Would it be advantageous to just have a uC that only communicates between the master device and the SD card, handling all that logic?