Here in Canada the price difference is about $100 between the Prelude and the PSR-S710, the latter being more expensive.

Here's a US site for comparison:

http://www.zzounds.com/item--ROLPRELUDE

http://www.zzounds.com/item--YAMPSRS710


That amount wouldn't keep someone in smokes for a month.

The PSR-S710 has style assembly and much better styles and sounds, in my opinion, anyway.

I didn't compare the GW-8 because it does not include speakers, but here it is anyway.

http://www.zzounds.com/item--ROLGW8

And here is the PSR-S550.
http://www.zzounds.com/item--YAMPSRS550

Ian

[This message has been edited by ianmcnll (edited 12-16-2009).]