Simply, they don't compare. The price alone should be indicative, although I must admit that in the world of audio price alone is very misleading.I did think about getting the CA DacMagic 200M, how does the iDSD Signature compare?
I do wish Creative had a more serious product; one what would match something like the iFi Zen DAC v2 with the gaming features of an X4...
The iFi is a world of its own. With all the I/O options it is as future-proof as it gets.
The Burr-Brown and the tube are vastly superior of the Sabre cr@p in the CA, hence the price.
iFi iDSD Signature is what you may want to consider end-game if you don't plan on $150,000 turntable later on.
Creative won't introduce anything like you need, simply because it's too little profit margin left for them, plus the market for such a product simply isn't there yet.
Their current top-tier stuff ends with 24bit/96kHz, which I admit is quite enough for gaming, as most in-game soungs are sampled even below 44.1kHz and there is also lossy compression at play. So, a 32bit/786kHz capable DAC is insane overkill.
It's like driving your Veyron to the local grocery store two blocks away.