The Ref 5se is very close to the GSPre. The Ref 6 is a bit better. The Ref 2se phono stage is also better than the one in the GSPre. The Ref 6 and Ref 3 Phono or Ref 2se Phono combination would be my choice. I own a Ref 5se and Ref Phono 2se and they are magnificent. The Ref Phono 2se has 2 inputs so you can have 2 arms or 2 separate tables.
BTW The GSPre is on my too ugly to own list. It just looks like it is upside down.