Would love to have the BDA-3 but $3,800 is well out of my budget.@dsands In that case I second the RME ADI-2 DAC FS recommendation above, as a much less expensive option that also uses the AKM chipset. The UI can be a bit daunting and lead to accidental misconfiguration, but once set up properly you can choose to never touch the UI again.
If you are looking for something that (I feel) utilizes the CS4398 exceptionally well, then I can suggest the Prism Sound Callia. While there have certainly been major improvements in DAC architecture over the years, there have also been improvements in people optimizing and maximizing the use of older DAC chipsets.