I have not dealt with any of the 3 sites you mentioned so I did a quick search for you to help you out:
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ChinaZRH is one of the largest online wholesale electronics market for no brand consumer electronic products and other innovative products. They have only been online for roughly 11 months, which is not long enough for one to consider this supplier 100% safe. They do accept PayPal payments and offer worldwide drop shipping services.
If you do decide to order from them, please start by buying in small quantities to test their reliability as a supplier as well as the quality of their products.
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Is a recently added SaleHoo supplier. They are a Chinese manufacturer of consumer electronics products. Their main products are MP4 and media players, Cell Phones, car accessories, computer and offices, cameras and camcorders, Security and Surveillance, home electronics, games consoles and gadgets and general accessories.
You can learn more about them through these links:Link hidden: Login to viewLink hidden: Login to view
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Sinosurge is a Chinese manufacturer of consumer electronics such as Mobile Phone & Accessories, Digital Products, Computer Peripherals, UMPC / Mini Laptop, GPS Series and Game Accessories. They also offer drop shipping services and accept PayPal payments.
Please note that the products they sell are brand name inspired only. Also be very cautious in dealing with them as they have only been online since April 2009. It would be best to try other suppliers for now.
Hope this helps. Please let us know if we can help you wit h anything else.