I think you'll find the higher end coaches from each builder will have a side radiator. I would tell you're friend to narrow his search down to several builders and then use NADA to find the approximate year that will fit his budget. Then look at the brochures from the builders he's chosen to find what models they made that will interest him. All the builders have an on line archive of brochures dating back several years.
I just purchased my coach in February that met his checklist except mine is an '07 with table and chairs for dinette seating. I used the method above and patience to find mine.
They likely will get the best bang for the buck by selling their current coach themselves and buying from a private seller. That takes more work but they'll get a better deal and will get to know the seller and how he has taken care of their soon to be coach.