We need to know your actual usage requirements (e.g. which software or type of software you're going to use, whether or not you'll use the laptop for GPU-intensive gaming, etc.)
Most users will not notice a difference between 4GB and 8GB of RAM, or between a Core i5 and Core i7 processor.
Unfortunately, I would not recommend the models listed above, as they all come with poor displays (15.6" 1366x768 and 17.3" 1600x900 displays, which make things onscreen large and generally have very poor image quality due to low contrast) and "meh" dedicated GPUs (which is only an issue if you're gaming, but is a big issue if you are).
HP DV6t Quad Edition (i7-3610QM, NVIDIA GT 650M, 15.6" 1920x1080 matte display) - $939 + tax after coupon code NBP9668 (Backlit keyboard configuration)
- Saved Configuration: http://www.shopping.hp.com/webapp/shopping/load_configu...
- Leave the display at its upgraded 1920x1080 option. The HP DV6t Quad Edition should not be bought in any configuration that includes the default 1366x768 display option, unless its larger text is required for eyesight-related reasons. 1366x768 resolution in a 15.6" display makes everything onscreen large, and 15.6" displays that have 1366x768 resolution tend to have very poor image quality due to low contrast.
- Don't downgrade the GPU to the GT 630M if game performance is important to you, because the GT 650M is considerably faster than the GT 630M.
- The 2GB GT 650M will not provide better GPU performance than the 1GB GT 650M. The extra memory is a marketing trick. Get the cheaper 1GB GT 650M.
- Note: Audio quality may be disappointing.