Sadly dont have too much time to look today but I normally shop MSI, ASUS and Sager. Remember Sager's do not come with OS and are best bought from resellers. You can often find prebuilt ASUS/MSI models on Bestbuy, Newegg etc, for custom I usually price up Gaming Laptops - XOTIC PC - Gaming Notebooks - Custom Laptops - Custom Notebooks
Not sure if the 6 series are out yet but quick guide for you. 560M is a bit worse than a 550 Ti desktop card, 580M is around a GTX560. The 6990M is a single gpu card dont get confused but Sager will sell you an expensive one that holds 2! 540M would be very minimal, maybe BF3 but more like BC2. Anything less = useless.
Laptop i5's are duals with HT, there ARE a couple high clocked Dual core i7's the rest are lower clocked quads. 1500 is usually the sweet spot in a midrange rig. 750 is usually bargain basement rarely brings anything in but 1000 can touch a decent machine once in awhile.
ORIGIN btw is like Sager they usually build off of Clevo chassis but sometimes Compal and others are used. Just about any of those boutique names you can come up with all build off Clevo laptops and Sager is the company i tend to trust. But the support is much better if you buy through a reseller like Xotic or GenTechPC etc.