I like all 3 to varying degrees.
Ox 1st. He's more versatile in the positions he could play and we have that connection with him where I want him to reach his full potential. Doubts over fitness though.
Depay 2nd. Was a great talent at PSV. Could probably flourish under Koeman, but must be on BIG wages and probably has worst attitude of the 3. He did cost United £30m though, so not sure how much he would cost.
Townsend 3rd. Could see him at Saints, but can also see him as Puncheon Mk.2 (in dividing fan opinion etc).