Hi,  I have an Optiplex 7050 SFF that I need to upgrade the GPU on.  I am a little over my head and can't seem to find much info. There is conflicting info online about what cards will work.  These are the options I have found that seem legit:

RX 6400 Low profile

GTX 1050 Ti Low profile

GTX 1650 Low profile

RTX A2000 Low profile

Is there a cheaper option as these all run around $200?

Could I use something like a Radeon RX 550 4GB?

As I understand it the card needs to be under 80 watts and needs to be pcie 2.0 x 16?  Like I said I'm in a little over my head and can't seem to make sense of it.  Sorry for the noob question!

Thanks!