I would have thought that it would be better to get started in the smaller and slower more "manageable" aircraft, then upgrade to a bigger bus later. Surely there's a lot less to worry about if you were starting from scratch on IFR if you're in a Seneca or Seminole...? A friend did his in a Chieftain and it cost a hell of a lot and made learning difficult. Is a Seneca really that bad for a first-off ME-IFR?