The machine where you lay on the ground and push up. I do it with the smith machine becuase we dont have one but that machine is the fucking best thing I have ever tried. Im not sure if that is considered a leg press though.
Either the nebula leg press the one that Ronnie loads up massively at metro flex or the cybex squat press.
Instead of a hack squat have you looked at a belt squat machine? Check out the pit shark