I'm returning back with more news and perhaps unsatisfied results, but with more questions. I apologize for the overwhelming amount of information I'm seeking, and I'm extremely appreciative of all the help all of you have given me. I'm slowly becoming a regular to this site (outside of my own thread), everyone is extremely awesome here.
Funny to say, today I was cleaning my house in preparation for my family to visit, and started cleaning under my desk. I thought "Does my computer have optical out by chance?"—it does. To my complete surprise, it does. I completely overlooked (plus smacked myself upside the head) the fact that my motherboard I built this computer with comes with a built in sound card, and the interface/options and capability was way higher than I expected. That must explain why I found the sound directly from my headphone jack better on the lower ohm headphones compared to the Modi+Asgard 2 with a higher ohm headphone.
Now new thoughts are arising; including one where someone said something along the lines of "you may not like the outcome of buying all these items, otherwise you will if you go big, you wont regret it". I didn't go as big as I could because paying an extra $100 for the USB on the Bifrost was a little more than I wanted to go for considering it was 1/4th of the price for 90% of the quality. Now that it's not as expensive, it's not out of the question.
This is where things get complicated as I attempt to search for more information online. For fun I plugged my Sennheisers 598's into the computer's headphone slot, and then plugged them into the Asgard 2 @ low gain (headphones have 50 ohms). The sound is so close, but my computer can actually put more depth into the music that I can notice. The DAC/AMP does give the headphones more oomph though (go figure), however sounds a tad flat. Right now I'm using an orchestra song with a singer at lossless quality—Fear Not This Night from Jeremy Soule. The song consists of build up, pianos while bass violins strum in the back, and a singer's voice who climbs to high pitches.
I have come to the conclusion that I just don't like the Beyer's. It sounds very airy, the treble is just too high. The comfort is amazing however. If you listen to the song I mentioned, at 28 seconds the bass violins queue in, and they feel so weak with the Beyer's. Almost as if they're not there at all. With the Senn's, I sink back into my chair and smile.
Anyway, I'm writing a book here; sorry. Back to the main point of this post. I notice the optical on the back of the computer and thought; would it be really worth selling/returning the Modi, and going for the Bifrost using an optical cable? Will I notice a significant difference because the fact I'm going optical (digital) rather than using a USB? Would it be necessary for me to install the drivers from their website to help it further?
If not, it makes me frown the fact I have two beautiful pieces of equipment sitting here on the table but may end up unused equipment. I payed huge for customs because I shipped to Canada, and I doubt Kijiji (Craig's List?) would even have such a market for it. Is it 15% restocking fee? I wonder what it would cost to even send just the Modi back from Canada.
Please leave your thoughts, and thank you so much again guys.