Welcome to the forum!
- The price on the Helios seems a little high by U.S. standards. The 44M-4 usually goes for under $30 USD.
- The Super Tak offers the convenience of the M/F switch. The Helios will require modification to convert the aperture to fully manual operation.
- Both lenses are decent performers as is the FA 50/1.4
Since you are a newbie, I would suggest that you shoot with the Tak 55/2 until you get the hang of manual lenses. If the experience is agreeable, you might want to try a Helios or any other fast 50 at some point, though I would not expect miracles! If you are willing to spend as much as $50, I would get a Pentax-A 50/2, Pentax-M 50/1.7, or Pentax-K 55/1.8. The convenience factor of the K-mount and automatic aperture is worth it.
Steve
(Love my Helios 44M, but realize it's limitations...)