Here are some suggestions:
http://www.newegg.com/Product/Produc...82E16834231083
$500
http://www.newegg.com/Product/Produc...82E16834230987
$530 after the additional $50 off
http://www.amazon.com/ASUS-K55N-DB81...ds=laptop+15.6
$450
Personally, I like Lenovo, HP Probook/Elitebook, and ASUS. The AMD A-series CPU/GPU chipsets provide excellent graphics performance for the dollar.
Using your specifications, here is the
list from Amazon.
For reviews, I filter by number of reviews and then look at ones with 4 stars or higher. I find this useful for most purchases.
I think the best value of the ones listed above is the $450 ASUS. Use the extra cash to buy a nice USB 3.0 external backup drive, computer bags, some mice, or a nice 1080p external display (or all of the above!).
Also, if ordering from Amazon, pay attention to who you are buying from. Amazon is an awesome seller and if you are dissatisfied with your laptop, you can return it within the specified period.