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I believe he has an ASRock Z97 Anniversary. Looking at the specs it says Realtek ALC892 with ELNA audio caps, if that's the info you were looking for.
If you only have $100.00 to spend I would go for the surround sound 5.1 speakers, you can hear what is going on behind you in gaming.
Just a suggestion to think about; no matter what chipset the onboard uses for sound, you can bypass it with a pure digital signal over HDMI to a HT receiver. Money would be better spent on a decent HT receiver and speakers, though of course this option would be more then a $100 budget would allow. However, you could start with just a HT receiver + 2 speaker + sub setup, and later on buy matching speakers to expand to 5.1 or more.