Upgrading from an Intrepid to a Dreadnaught (I or II) will be a pretty huge improvement.
Casanova to Casablanca upgrade will depend on how good your source is and are you using analog or digital inputs? a Casablanca with superior DAC's are pretty good but the Extreme card is pretty amazing. I would hold out for a Casablanca III instead of a Casablanca II. The Casablanca has an Analog pass through volume control so if you have a really excellent phono preamp or CD player, the Casablanca is a pretty amazing 2 channel preamp. I don't how the Casanova handles analog inputs.
Casanova to Casablanca upgrade will depend on how good your source is and are you using analog or digital inputs? a Casablanca with superior DAC's are pretty good but the Extreme card is pretty amazing. I would hold out for a Casablanca III instead of a Casablanca II. The Casablanca has an Analog pass through volume control so if you have a really excellent phono preamp or CD player, the Casablanca is a pretty amazing 2 channel preamp. I don't how the Casanova handles analog inputs.