I finally bought 507u today, thank you all ching help here
Just so u know the service of Yui shing 11/f is suck, they not allow u to test the sound or qlty of the product performance before u buy since it is not yet to be made the connection to speaker so I went to true sound at cwb even their price is higher n out of stock in which hv to wait couple days but it deserve is because they show the qlty of service at least I was buying happy...