Since the NADA numbers are mathematically depreciated for RV's and not based upon actual transactions, I assume the HR Imperial is worth @ $11K more than the Contessa if their condition is equal because its MSRP was probably higher.....
I believe it was higher in the model rankings for HR and should have some additional features that the Contessa does not have. You should be able to see where each ranked by looking at the MSRP price stated on NADA.
Beaver had the reputation for excellent cabinetry work.
I would suspect the Contessa is over priced based upon the info you have given and might have room for a much lower offer price.
The updated TV's are not a big expense unless significant cabinetry work was done to mount them. The satellite antenna might be near the end of its useful life if installed in 1999.
Of either of the rigs has the Aqua-Hot or similar system, that could have been a $10,000 option when new. Be sure both have a diesel generator.
JMHO, with no experience with either unit.
1995 CC Magna #5280
C8.3L 300hp Cummins, 31,000lbs