Penn's 525mag is a solid basic reel if you can find a good second hand one.
Mine has withstood all forms of abuse and neglect without problems. It would hold more than enough of your 4-6kg line for most fish. A big ray might see the end of the spool though..
They're not available new these days as far as I know, having been superseded by later models under different names ( Phil would be in the know there)

Not sure if your veritas rod would suit a freespool reel. Freespool rods usually have different guide spacings to avoid the line touching the blank under full bend..

Welcome back to the dark side... Muuaahhhahahahah