If you are spending this kind of coin on everything I don't think the DAC on the ipod will do it justice. There are some decent docks that extract the digital signal from the ipod so that you could use the DAC on the nova. I'm sure this would sound better but I have no idea on cost etc.
Of course, this all assumes you have reasonably high bitrate files on your ipod. If not, it doesn't really matter so much.
For speakers, look at Quad, Gallo, Zu Audio, or Magnepan MMG's, (though i'm not sure even a nova could power them).
My dream speaker is a pair of used Gallo Reference 3.1. Can be found used for 1200 or 1300. They don't make them anymore. The Zu are great with lower power amplification. If you got a Decco they'd be my first choice for sure.
Oh and btw, sensitivity is also referred to as efficiency in many spec sheets. The higher the number the less power hungry.