I totally agree with Graham.
From my own long experience (40 years ), your best bet is to visit as many local dealers as possible, tell them how much you want to spend, and say you want to buy a used board with a guarantee. You will get the opportunity to own an uptodate board with uptodate systems.
Good Luck
Eddie

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Eddie from Rotherham
Skype:eddiefromrotherham
www.yamahakeyboards.info