The Yamaha PSR 3000 or Tyros will do exactly what you wish, both are very user friendly, and you do not need lots of software to get the job accomplished. The other two choices will also do the same job, however, I don't believe they'll do it with any more effeciency, the systems are not as user friendly and if you ever do wish to expand to other genres of music, or live performances you have those options using the arranger.

Good Luck on your choice,

Gary

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Travlin' Easy
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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!

K+E=W (Knowledge Plus Experience = Wisdom.)