Took a peek at newegg and found a few things you might be interested in. All have 6GB ram and a 640GB hdd.
The first is a new Toshiba Satellite with windows 8 and a A8 4555M APU for 499.99 and free shipping. DDR3 1600 ram helps the GPU in this one.http://www.newegg.com/Product/Product.aspx?Item=N82E16834216041
Next is a refurbished HP Pavilion with windows 7 and a A10 4600M APU for 479.99 plus 13.72 shipping. Fairly fast CPU and fast GPUhttp://www.newegg.com/Product/Product.aspx?Item=N82E16834256535
Another refurbished HP Pavilion with windows 7 and a A8 4500M APU for 479.99 and free shipping. Its somewhat slower than the 4600M.http://www.newegg.com/Product/Product.aspx?Item=N82E16834256633
Finally, a refurbished Samsung with windows 7 and a A8 3510MX APU for 429.99 and 13.72 shipping. Stars quad core for video editing and a decent GPU.http://www.newegg.com/Product/Product.aspx?Item=N82E16834131275
Search AMD Fusion on wikipedia for shaders and clocks on these APUs ( I will say these 4xxxM series APUs are dual module with 2 FPU and 4 integer).
Also, the newer integrated radeons in the 4xxxM series are VLIW4 versus the 3xxxM series with VLIW5(vliw4 is about 20% faster per clock than vliw5).