Looks like a very long standing thread but let's keep it going! I use a Roland G-70 workstation. It has an onboard 16 track sequencer but I find that if you want to add vocals or other instruments in Cubase SX3, it's better to retain the flexibility to keep all the tracks separate so I don't like exporting a ready mixed arrangement from the keyboard.

As for the why: Well the Roland G-70 has everything you need to sound like a musician when you're not really!

Gerry