For sure: I do not doubt that the HiFaceII was way down on your list for a good reason. I am still using the HiFace2. And I am looking forward the getting the Pro3A, - to test against.
Edit: adding, - I meant that I have no doubt that the Pro3a will beat the HiFace.
Cheers,
will you be using a linear power supply with the Pro3a?
you'll get the best results... but on usb power it's good. if your usb is super clean power than it should be great!
but most people have 20mV noise on their USB line. that's...uhm. bad.
low noise psu's like corsair are around 8-12mV, and thats "acceptable"
cheapo linear psu's like teradak dc30w are around 1mV which is "good"
and high end psu's like Paul Hynes, IFI iUSB 3.0, Mojo, and obviouslys the Uptone Audio JS-2 will have ultra low noise from .1uV - 40uV
anything in the low microvolt range is excellent.
the pro3a has regulators that are 1uV so it cleans up most of the signal, so feeding it something from a teradak dc30w is usually ideal and will be sufficient for near max performance.
definitely cheapest route.
I'm going to add a belleson regulator to my Teradak DC30w to get 5uV noise output. I'm installing a SPJ17 5V regulator. down side is that i'm going to be limited to 5V if I use that regulator. thats ok, I considered using it only for 5V anyhow. The DC30w is awesome since you can easily switch voltage by opening it up and using the adjustment screw to change voltage. use a voltimeter to verify.