Lens Advice -- in the 25-35 range, primarily for video, fast.

I'm in the market for a new lens for my a6000. A couple of months ago I bought a Touit 32mm f/1.8, and loved the IQ, but was not a fan of the focusing system. Any footage I shot without an external audio recording was plagued with the noise of the focusing motor. I returned it a few weeks ago and have been relegated to the kit lens (bleh) and a Nikon 50 f/1.8 on a cheap adapter.

I am looking at focal lengths somewhere in the 25-35mm range. Heavy preference on primes, but if there are zooms around that range with constant aperture that is fine. Fast aperture, probably under 2.0, is necessary. I do not need autofocus. I never use it while shooting video, and am fine with manually focusing for stills. So I am open to both legacy and video lenses. I guess my budget is around $500, but if there is a lens that would work very well for my uses, I am flexible.

Right now I am looking at Rokinon's 35mm or 24mm lenses. There seems to be a few variants at each focal length and I am not quite sure what is the reasoning behind the price differences.