Hi, I'm Graham Goode from Johannesburg, South Africa. I play Organ, Piano, and Guitar, and just love MIDI! We have a dedicated multimedia PC with various virtual pipe organs, samplers, audio editors, etc. Two MIDI keyboards and a 30note MIDIfied pedal board.
We use jOrgan, MyOrgan, LinuxSampler, Hauptwerk, Kontakt, GIGA Studio, Qsynth, SFZ, ASIO4ALL, MIDI-OX, MIDI Yoke, Organ Samples, Orchestra Samples, Piano Samples, Guitar Samples (you get the idea!).
I recommend the Jeux D'orgues sample set for MyOrgan when introducing people to the concept of Virtual Pipe organs. Then once they are interested it's onto Hauptwerk or LinuxSampler (depending on their budget and needs).