I'm looking for a 1000$-500$ one preferbly. Any suggestions?
It's going to be used mainly for gaming.
A lightweight gaming laptop doesn't exist and is a bad idea... a good idea might be a cheap and really light laptop paired with a gaming desktop or an upgrade.
I'd suggest an ASUS GV46
http://www.amazon.com/Asus-G46VW-BHI5N43--i5-3210M-2-5Ghz-GeForce/dp/B00AWJX7JU/ref=sr_1_1?ie=UTF8&qid=1373839165&sr=8-1&keywords=ASUS+G46VW
They have a refurb'd ones on Newegg for a lot cheaper.
http://www.newegg.com/Product/Product.aspx?Item=N82E16834231001