Recently I needed to switch to the portable computer, and now I have Dell XPS L702X, with good high-quality 2D full HD screen.
Specs are: i7-2670QM CPU, 8 Gb of RAM (upgradable up to 16), and GeForce 555GT with 3 Gb VRAM.
Maybe it's not the toppest "gaming RIG" but DCS works pretty solid on this system, not to mention Battlefield 3 also.