Ooops... sorry, I was typing one handed while feeding my small son with the other. m/c made perfect sense to me as an abbreviation for "machine", but I can see now that's gibberish. My bad, sorry for the confusion.
I posted two links. The first was to the page where you can view all the combinations available for the C6501e/eP, and was in response to VTsignguy's request (I hope that helped).
The second link was to a base configuration machine and was to make a simple point, i.e. that the 6501 is also available as the print engine with very little else. It's still a 6501, but if your expectations are that you are going to get good registration, flat sheets, accurate colour etc. then IMO with the basic machine you are going to be disappointed. I think the reasons should be pretty self explanatory; for example you CAN have a basic photocopier type feeder tray, but that's not going to give you the same level of accuracy and productivity as an LS-502 with air seperation, pre-heaters, paper thickness adjustment, gripper adjustment etc, etc.
Again, sorry for the confusion, I won't try and post off quick answers to people's questions again!