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i also had the same choice when i bought my car and i went with the gs cuz its a lot sporty plus they make a lot more after market stuff for it. still i find my self looking at an ls when they pass by but when i turn around and look at my car i tell my self i did good, i did good!
Having had both vehicles the LS460 wins, it is also much more reliable. The only issues to check for them is the front ball joints, other then that they are solid and will last many many years