I got a $1000 ASUS gaming Laptop from Best Buy in 2009. It crapped out after a year and a half, but the Best Buy warranty covered it. The stipulations of the warranty said that the failing laptop could be subbed out for an equivalent or better one -- since that was one of the rare laptops with a modular video card, and they had no other modular laptops in the store, I walked out with the best ASUS in the room, a $1200 display model. That laptop has lasted me 3.5 years and counting, and runs pretty much everything you'd want it to at a decent clip. That same laptop probably costs in the $700 range now, if that.
So what I'm saying is, yeah, you can get a decent gaming laptop, but you've gotta be willing to pay for it, or at the very least luck out into it.