Nice. Think about getting a laptop cooler if you plan to use this on your lap or on a surface that will block airflow. The video card alone is 75w. Battery life must be interesting under load.
Your laptop will outgame my i7-920/gtx260 desktop.
"Built-in 802.11a/g/n WiFi Card + Bluetooth 3.0 (should I a better card? My internet is 25/5) " Unless you suspect the card you are getting is inferior in some way you can't do better than 802.11n.