Powerful Gaming computer swap for gaming laptop/macbook !

Hi, I am wanting to trade my gaming desktop for a gaming laptop. My computer has the following specs: CPU - Core i5 2500k at 4.8 GHz Motherboard - MSI P67A G45 B3 Graphics card - EVGA nvidia Geforce GTX 580 1.5 GB GDDR5 RAM - Crucial Ballistix 1600MHz 2x4GB - 8GB total Case - Corsair Carbide 500r Power supply - Antec Trupower 650W Hard drive - 120gb Corsair Force 3 SSD + Western Digital Caviar black 750GB HDD The system is water cooled by a Corsair H100 cooler. I know how much the above is worth, I see that most of the ads on gumtree for