I would advise against starting to replace many parts at once. You don't know if the previous owner has already replaced some of them.
That noise is a little strange, I think you can try locating it more precisely using a 1/2" hose, one end at your ear, the other near any parts - careful near rotating parts. Also listen to the pump and look inside the reservoir.
Above were mentioned several parts, but again I would rather test each part before going replacing it. The spring seat is known to fail, you can try looking with a flash light like in the video, in between the two rubber plates for any cracks. From the video there is no strange movement. We can see there is some sort of a friction, but not necessarily from the spring seat. Try to depress by hand strongly downwards near the top of the strut, hear for any noise.
This is how to easily check the control arm, see how bad it is www.youtube.com/watch?v=P1QaJbyjr2s
How is the car riding? Does the suspension feel too stiff/harsh? If not, don't replace the struts, even more so if the roads in your area are smooth. The original suspension works for a long time on good roads, and aftermarket options give far less handling.
We prefer to buy from sites like Fcpeuro or Ipdusa brands like Sachs, Lemforder, Bosch. This is the trick, because otherwise, replacing original parts with lower quality brands is what brings the quality down on these cars.