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 You cant go wrong with a Helios 44-2, best of the range in my view, the preset is a good system and the ring is nice and loose!

 

What body are you using it on?

 

The a6000, that is APS-C, that is a portion of the area with the swirly bokeh will go out of the frame. But the swirly bokeh is not the primary thing that interests me... I've seen many photos with the swirly bokeh and I liked only a few of them. It's a difficult feature to manage.

 

PS In any case... there's a "turbo booster" M42 / E-mount adapter with a lens inside that "shrinks" the FF area into the APS-C area, like the similar Metabones adapters for Canon mount. It's not cheap (150€) and I've read mixed reviews about it. But it could be a future thing, low priority, that would enable to have the full swirly bokeh on the APS-C...