I cannot help re upgrading the unit but its obvious that the X5 is fine for light - medium use but is not likely to be up to the task for heavy duty work on a daily basis. I'd be very interested to hear further reports from PrairieRose.
Cptken ... I'm not looking at the manual but if I remember rightly you can adjust the response reset auto number to reset to the number of your choosing. Its in the setup menu.
"Do you think God gets stoned? I think so... Look at the platypus." Robin Williams.