For swirly bokeh you should get Helios 44-3. It is basically the best bang for the buck. It is the exact same optical design as the 44-2 except it has better coating to reduce flare and is sharper too. It even has the same number of blades: 8. Be careful of "M" versions, which normally have longer min focus distance.
One last thing. If you go for the 44-3, be sure to watch out for one potential issue. In some versions the focus rings protrudes beyond the flange and does not allow for the lens to be mounted on cameras other than zenit. An easy solution is to remove the ring and file it:
https://www.pentaxforums.com/forums/pentax-slr-lens-discussion/77158-caution-...ml#post1984654
Otherwise, you could also just look for a version of the 44-3 which does not have that problem. There are so many available!
Just be aware, the swirl isnt something which is always there in EVERY picture. It only appears in specific settings when the subject and the relative background are at a particular distance from you.