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Definitely replace the OPAMPs though. Although, the Xonar DS is far cheaper, and with an upgraded OPAMP and shielding it sounds pretty darn good.
Replace which OPAMPs with what? (Unless there's only one socketed OPAMP, but the higher-end cards tend to have several.)
At the very least, I've found that replacing the JRC OPAMPs in my Titanium HD with LME49860NAs resulted in a horribly steep V-shaped frequency response. Ridiculously boosted bass and treble, terribly recessed mids. Thus, it's not something to be done aimlessly.
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So which is better for what? RTS, RPG, FPS, Adventure, Movies, Music...
The basic gist of it is that any game that uses DirectSound3D or OpenAL will sound better on a proper X-Fi card because of how CMSS-3D Headphone uses the 3DPA data, and also because of the games that use those APIs also frequently using EAX 3/4/5, which you can't get proper implementations of on non-Creative-based hardware.
However, that's mostly covering games from 2006 and prior. 2007 and onward brought a rise in XAudio2 + X3DAudio and FMOD Ex usage, mixed and processed all in software, so it doesn't really sound any different (no missing reverb/chorus/occlusion/etc. effects like if your card didn't support EAX) between audio devices. Unfortunately, you're limited to virtual 7.1 at most no matter what you go with, whereas it was possible to get proper binaural audio with the old APIs. This also eliminates CMSS-3D Headphone's binaural advantage over Dolby Headphone, making them play on the same field.
I still like the good old games, thus I consider good DS3D/OAL/EAX support a priority. Not all people share my appreciation for old PC games, though (not even hits like Unreal Tournament and Battlefield 2), and thus such things are of little importance to them. They don't feel any particular incentive to get an X-Fi card if most of those gaming features go unused in the games they play anyway.
That said, the X-Fi Titanium HD has great analog RCA outputs, making it a viable analog output card regardless. It'll feed your Objective2 very nicely.