My motherboard i.e. MSI Z68A-GD80(B3) comes up with
THX Certified Onboard sound card.
Here its specification-
THX TruStudio PRO
THX is a trade mark of a high-end audio/visual reproduction standard for movies, home theaters, computer speakers and other audio devices. THX Certified Audio products are designed to let users experience movies & videos as live show. The true sound effect can make high definition video more powerful.
Features
- A high-fidelity sound reproduction standard
- Accurately reproduce the fullest audio experience of movie, music and game soundtracks
I have quite decent room for 5.1 setup.BTW. i have Logitech X210 2.1 speaker but i need surround sound experience like movie hall not like IMAX or Inox but decent enough.
Even though they are certified, they may sound little better compared to any other onboard but a Dedicated Sound Card may enable a option for you to hook up some heavier 5.1's like DA5000, assuming you can upgrade another 5.1 soon.
Like what
Megamind suggested, 5.1's like Onkyo, Logitech Z5550 or even Edifier DA5000 will be a nice suggestion that we can provide you atm, but if you look back at your budget then surely not.
If you want theatre like experince then definitely IMO get a Sound Card like Xonar DX, even your current
Logitech X210 2.1 will roar like some sound-king.
the ball is at your court, you can decide.