If he's taking piano lessons go with:
-Yamaha YPG-735 for €750 (88 weighted keys)
-Casio Wk3800 for €650 (76 keys)
Both are great keyboards, although the Yamaha will be worth more on a trade-in if they decide on something more substantial down the road.
Also, if he doesn't continue with the lessons, the Yamaha will be easier to sell.
Ian
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Yamaha Tyros4, Yamaha MS-60S Powered Monitors(2), Yamaha CS-01, Yamaha TQ-5, Yamaha PSR-S775.