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I was thinking of getting the 17 Inch,2.66GHz Intel Core i7,4GB 1066MHz DDR3 SDRAM - 2X2GB,500GB Serial ATA Drive @ 7200 rpm with NVIDIA GeForce GT 330M with 512 MB of GDDR3 memory, but i need to know if these specifications are good in terms of speed and performance so as to attain full benefit from the price that i am paying. PS. is it better to get the 8GB 1066MHz DDR3 SDRAM - 2X4GB.