I'm with JMo.
I think a DRZ400 is the perfect bike for a privateer on a budget. The motor is reliable enough to need minimal maintenance and run a marathon class w/ no issues. The engine should not have be considered a consumable.
If one got the S version or the SM version on top of that you would have a sturdy subframe to hold rear tanks and a stron electrical system to run lignting and gps/nav equipment.