those prices are recommended retail not street...but it should be pointed out that the xs8 comes with a bit mroe than the 7 or 6...built in computer interface, vocoder etc..options only on the others...when it became available i couldv'e got an xs7 for about the same as the sd1+ (under $3500AUS) but there were none available and were not going to be so for several weeks (at the time i bought the sd1+)...mind you i am now considering a move to the Kurzweil WEIGHTED action 76 note piano with the new Ketron SD3 module (the sd5 in module form) might depend on dollars though..
dennis