Uncle Ben..Do you sing? Do you need a mic input?
How about a vocal harmonizer..does that interest you?

Since you are comfortable with Yamaha...I think it may be fine if you stay with Yamaha..

If you sing and think a vocalizer would be interesting, there will be many PSR3000's available, because many are up grading..

They should be found easily under a $1,000..

If vocals are not important[not sure if mic input is on the S-500, but I think so]..the S500 may be a good choice..

I am a strong Roland fan, and I would always say go for the Roland..but in your situation and comfort zone..stay with a Yamaha..