Digital Projectors at Walmart

I found a few digital projectors at Walmart today. They are the Epson Powerlite Home Cinema 500, The Epson Powerlite Home Cinema 707, The Optoma Playtime PT100, Optoma Gametime GT200, and finally, Optoma Movietime MT300. What are the specs for each of these projectors? Is the Optoma MT300 the same as the Optoma ML300? or are they different types of projectors?

I saw an ebay auction of the Optoma MovieTime MT300 advertised at Wal-Mart as a rebranded Optoma HD66. Does anyone know if that is true or not?

Thanks HDTV. I was looking to confirm the specs on the MT300 at Wal-Mart. I have set my eye on a BenQ MW519 or if I could afford it the BenQ w1070? That is if I can find a BenQ w1070 seller in the USA.