hi everyone.. i'm going to buy a digital piano, which one is better between yamaha YPG 625/ DGX 620 and casio PX 410R.. both are same price. I heard DGX 620 hammer weight is not good? also I heard that if you hold the pedal and play on high volume PX 410R will make a 'hissing' sound? what are DGX620 good points? what are PX 410R good points? which one has a better Grand Piano sound? which one has a better sound quality?

actually I'm interested in classical piano, but I affraid that someday I'll get bored, so I picked between DGX620 and PX 410R because they can be played as a Keyboard Synth,rhythm, unlike a pure digital piano like P70, PX800..