If he’s not willing to buy a 650, convince him atleast to get a 450. If you want a similar character of the engine for a bit more money, go for aprilia rs457. If you want a different experience but same power and thrill get a himalyan 450. Bol dena, maana ki 650 beginner bike nahi hoti but 450 hoti hai. But yeh sirf tumhe pata hoga ki 450cc ki yeh dono bikes sm650 se bhi achha power to weight ratio rakhti hain