Gaming Laptop ASUS G73 or 3D Laptop

hello guys, im currently planning to buy a new gaming system, I like laptops a lot and I use them for college, mostly for programming and hardcore gaming, thats why im plannig to buy a desktop replacement laptop. I currently own a dell XPS M1530 with 2.2 dual core processor, 4gb DDR2 Ram 800mhz, 120GB HDD 5,400RPM and an nvidia 8600M GT GPU. As im a hardcore gamer I want to buy a new system that can give me better FPS on today´s games and better performance on apps and games. Now im playing WOW because its the only game that maintains a decent 30FPS most of the time. I played Dragon Age with really bad performance (6 FPS min and 20 FPS max), and I really got very upset with this bad performance. So im planning to buy the asus g73 from best buy that cost 1200 usd with core i7, 6 GB ram, 500gb HDD, and ati mobility radeon 5870. My question is: should I buy this laptop right now(I really want this asus laptop and I cant wait to have a better system)? or should I wait until 3D gaming laptops drop their prices and are more in the market?. I want to have a new system that lasts for 3-4years or more so I want it to be futureproof. Im asking this because I think 3D is the future of gaming and I dont want to spend some money on a system that would be useless after 1-2years. Ill be waiting for your replys   thx