Hi,
On dell's site I customized an xps15 with i7-2670QM, nividia GeForce GT 540M 2GB graphics with Optimus, and 8GB ram...
for ~1325$+tx
The G53sx I was targetting comes with the same processor, 12GB ram (same speed), and nividia GeForce GTX 560M - 2 GB GDDR5 SDRAM...
for 1500$+tx
So...