upgrade suggestion please for Zu Omen def

Although I am quite happy with my system, the upgrade bug bites me again. My current system has the following:

Computer
Audiogd NFB-3 DAC
PrimaLuna Prologue 3
Cary SE-1 power amp with 2A3 tube
Zu Omen Def speakers

Based on the reviews and comments, I am looking into the following options (and I didn't heard any of them)

1) replace Cary SE-1 to Melody I2A3
2) replace PrimaLuna and Cary with Almarro 318B
3) replace PrimaLuna with Supertek preamp

I think all the Melody I2A3, Almarro 318B and Supertek all with excellent feedback. The Melody I2A3 has rave review and match very well with Zu per the 6moon review. The Supertek has rave review by the community. The Almarro has rave review in 6moons as well.

Is there anyone has experience with any of them with Zu Omen Def can comment? I like to listen to female vocal, guitar, violin and saxophone. To keep the discussion focus, please limit to the options above.

Thanks in advance