Tatter,
I own both the Tyros and the Motif. What I will say in general is this to your last Q. One needs to be ready to move to a workstation like the Motif. While the sequencer is great and allows for what you want to do, seperate instruments of your choosing on all 16 tracks, the learning curve on a workstation is quite a bit more than on an arranger.

The Motif manual is online, you perhaps want to have a look at it and also visit the Motif forum and see if it is something you want to buy into. I love it as do most MoBros however it is a challenge for many.
http://www.motifator.com/es/index_es.ph

Terry

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jam on,
Terry http://imjazzed.homestead.com/Index.html