How convenient. I'm currently going through some of the same headaches with "not enough usb bandwidth" errors. Some things that would help me would be, upgrade my m10000 to either the mII-12000 with the PCMCIA card slot and the extra up to 8 onboard non-hubbed usb spots, or the faster sp13000 without PCMCIA but with the same 8 onboard non-hubbed usb spots.
A lot of my issues has been all of the hubs, none of which are running of the PC's 5V rail.
I'd love to hear your final decisions as to what to do.
Also, what MOBO are you running?