If you are going to replace the flex disc (you should if swapping racks), just delete the stupid thing and bolt the flanges together with spacers. No slop.
And -- there's controversy about how good it is to delete PS on a PS rack using a plate like that, better to get a real manual rack if you want manual steering.
That said -- why would you? The racks you mentioned are great PS racks, e46 swaps are common as well (I <3 mine)
Good rack and guibo delete, you'll get a much better steering feel.