I do not know anything about Xaxe.com, but topearl is definitely one to stay away from.
This is just my opinion, and I know it is hard to view it as being completely unbiased, but treat any and all companies selling out of China as would a responsible gambler. Only spend what you can afford to lose, because you will lose with almost all of them before you find a winner. And even those that are winners rarely win consistently.
Also, don't fall for the "first order" trick. They will treat you great for the first few $50 orders, and then hammer you on the big ones.