If I had a ceiling of about 800 dollars ( give or take a few ) and I needed an arranger, I'd probably try to find a used PSR2000. If I wasn't able to find one at that price and I didn't need a harmonizer, I'd try to find a PSR1000. The 740 was also a decent board for the money, although I think that most who have it or have used it would probably say that the harmonizer wasn't particularly good in it. It also lacks the voice editing features and sequencing capabilities of the 1000 / 2000, if it matters. They can be found, however, for a lot less than 800 dollars these days.
If "new" is the priority, then I would have to agree that the 550 might be the way to go at that rate. Another board selling "new" ( it is an older model now ) at less than $ 800 is the Casio MZ2000 ( someone had it "new" recently for $699, but I cannot recall who or where that was ) . Other than the lack of customer support offered by Casio, I think it is a good value at that price if one does not need a harmonizer. If they get any cheaper, I might pick one up again too.
[This message has been edited by Bluezplayer (edited 09-23-2002).]
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AJ