Hi --
MIDI is pretty much MIDI.
So, any MIDI-capable DAW should do the job.
What makes a MIDI song specific to a particular arranger are the program change messages, DSP effect set-up messages, etc. The PSR E series has a relatively limited MIDI implementation, so the learning curve is not as steep as SX series or Genos. I recommend reading the MIDI reference for the EW425 and keep in mind that it supports the most common MIDI CC messages like channel volume, pan, chorus level and reverb level even if those messages are not explicitly described in the MIDI reference PDF.
For this job, I'd go with Cakewalk (a tool that I've used successfully with PSR and Genos for years). Ableton is a good tool, but I don't think of it as a Standard MIDI File (SMF) song editor like Cakewalk or Cubase. Garageband has its own quirks and limitations when handling external MIDI files; Apple limits the feature set so you'll buy Logic.
Just my two cents -- pj