Its a tough choice but I think I'd go for Opeth-Orchid for the metal and acoustic songs but I still think seventh son of a seventh son would be pretty awesome too
I'd be happy with these two songs... [ame=http://www.youtube.com/watch?v=_HF5puYKMtk]YouTube - Kromestar - Aggravation [Dubstep][/ame] [ame=http://www.youtube.com/watch?v=5nXz6GpD4fQ]YouTube - Kromestar - Sub Meditation[/ame]
^^ Opeth-Orchid is an amazing album. Good choice my friend. Akerfeldt writes great music. Only one album for the rest of eternity would be rough, but id have to go with the jonesz.