Unless one is making a living with a camera all of them are a luxury item
You need a camera that is worth your investment that will accomplish what you wish to do. If you can do that with a Lubitel or Holga then either one would make a good choice.
If you want a good camera with a minimal investment then I would recommend a manual focus Pentax or Minolta with 3 or 4 good lenses. I would shop carefully for a clean used camera and clean used lenses. This I believe will do more for your photography then a used Leica R camera with a 50mm f2 that requires such an onerous use of available funds. In choosing such a camera I would hope you can get a 2 week rerurn priviledge from a vendor of good reputation. Be careful that you choose something that will cause you gno rief when trying to find batteries that meets the camera's requirements. Be very careful that the lenses choose are built with sufficient durability.