Which beyerdynamic DT 770 PRO for use with onboard audio

[Jack Kaye Pc Gamer]

I'm looking at getting some beyerdynamic DT 770 PRO's but there are 3 different options with difference impedance ratings, 32 ohms, 80 ohms and 250 ohms. I know I would need an amp to run the 250 ohms version but I'm unsure if my onboard audio would be able to handle the 80 ohms version or if I'm better off getting the 32 ohm version. I'm looking at getting headphones which don't require an amp as it just adds extra cost and the sound quality increase isn't worth the price for me.

 

My motherboard is the MSI Z97 Gaming 5

[StareX]

I would personally go with the 80ohms version, but if you can get a DAC/Amp like the Schiit Fulla, it would be better.
I would never drive these headphones or any professional grade headphones via onboard soundcard unless I really want to "save up for now"...

 

Nonetheless, they would suffice.