I agree with most replies. We love our pusher, 2004 Monaco Knight. Our 8th coach and it is a keeper bought used in 2006.
There is more living space in the front as the driver and passenger chairs rotate.
In my opinion more money for upkeep with the diesel.
However regardless of how nice the 2000 unit is you are looking at it is still 14-15 years old.
Personally I would not buy a coach that old regardless of price due to "not knowing the coach". If I owned it 10-12 years that is different based on understanding what the coach needs.
Keep the class C another 3 months and then decide on your next move.
As you camp ask to see your neighbors coach, most everyone will tell you anything you may want to know.