Money isn't an issue, time is though: which would you recommend for a busy dad with a half hour long train commute that wants to play a good RPG: Final Fantasy 4 or Chaos Rings 3? Or is there another RPG you'd recommend?
CR3 is hands down the best mobile made RPG you can get. Many people will agree. HOWEVER, if we're talking ports (FF4), I can't really comment on that since you probably know how those play and you'll probably get what you expect. More old school style obviously. They're both pretty in depth but since CR3 is made for mobile it has more ease in pick up and play that a Final Fantasy game. If you want something even simpler, Kemco RPGs are fairly short and don't require too much investment.