THX TruStudio Pro from the Recon3D USB sounds great to me, my first test made me think "Finally! NOW It's working well!" I would NOT recommend buying a Recon3D soundcard, Creative cut some corners with that line and the X-Fi and Z series cards are much better internal soundcards, but the USB model I have is good: digital connection & processing for computers (Mac-specific drivers too!) AND consoles (somewhat unique in this respect, internal soundcards only accept 2 channel PCM from consoles), small and appropriate to transport like your Pioneer device, THX mode is tweakable and settings are carried over to console/optical connections, etc. The only thing I DON'T like about it, so far, is the built-in amp. The upshot is it doesn't produce background noise, but it was designed for 32 Ohm, easy to drive headphones; my Q701's sit at near max volume setting for listening volume, and it sounds flat with an odd eliptical soundstage. Turning the Recon3D USB's volume a bit down from max (to avoid clipping) and double amping actually does a good job and makes sound more punchy, full bodied, and the soundstage is much more rounded out and deep. Now, if only it could adjust chat mixing with the Xbox 360, it would be golden. Oh, I guess I should mention the Recon3D USB doesn't decode DTS over optical either, but since I don't have a Blu-Ray player (plus Mad figured out how to have the PS3 convert DTS using bit streaming) I haven't run into any problems. I bet you could get PC software to decode DTS movie soundtracks for you anyway, too.
If you don't game on PC much, the other option would be to replace your Yamaha receiver with a Marantz with Dolby Headphone. You get all the receiver setup convenience, though of course you lose the positional audio advantage available in PC gaming. Another thing to consider (for headphones) is getting a soundcard that has a powerful built-in amp (like the Asus STX, and the Creative Z-series cards are supposed to have powerful amps too) so you wouldn't need a second dedicated headphone amp. The Zx model in particular may be perfect for you, because it includes a module for volume control and plugging in headphones that can reach out from your closet to somewhere more convenient (does it get hot in there?). I happen to like headphone amps though, particularly my tube hybrid
Since I like the THX TruStudio Pro processing for surround better than Silent Cinema and all the samples of Dolby Headphone and CMSS-3D I've heard, I'm very curious about Creative's newest Z series internal soundcards (yes, I've heard from many people that SBX = THX without the brand fee), but for now I'm happy with what I think is the IDEAL surround processor to use with all my devices, for the money. I'll probably end up getting an internal soundcard from Creative someday, though
Edited by Evshrug - 2/4/13 at 12:09pm