any laptop with radeon 5650hd graphics will be suitable for gaming. I have one and I can play any game perfectly on medium settings (eg.borderlands, saints row III etc) although I much prefer gaming on my monster of a beast PC, I use my laptop for lighter gaming such as DOTA and CIV as well as a few music programs.
The 2 specifications you would be looking for are
i5 (or above)
ati radeon 5650HD (graphics is a must have for anyone playing games, if you see anything such as "intel hd graphics" or "integrated" just run the other way.
and the rest is upto you. Most laptops with specs like that will come with a decent HD and RAM.
Just remember those first 2 are pre-requisites for you.
Im basing these specs off of my own toshiba sattelite laptop. You should be able to find one with those for $500 - $700.
EDIT:
I work with a LOT of Lenovos, them being are main supplier at the school. They disgust me. I think you should consider anything other than a lenovo or Acer for that matter, just based off of person experience.
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