Looking for a decent gaming laptop

I have been looking for a decent cheaper manufacturer refurbished gaming laptop, specifically from Dell. Since this is really the first time I have bought a laptop to primarily play games on, it doesn't need to be anything fantastic and extremely expensive. Just something that will do the trick and will run most games (not necessarily on highest graphics, but at least decent). I am looking at Dell laptops from their Dell Inspiron 15 series, but I need to know which one from the series will work the best. Take a look at this link to see some of the options from Dell's website. If you could tell me which specific laptop would work the best out of this category, that would be great. I will also take other suggestions from different brands but I would like them to stay under at least $650 (trusted manufacturer refurbished). Thanks