Um, the CheyTac Intervention M200. Shoots a beast of a round, and it looks pretty badass. I also like the HK-416. It's like if you took the reliability of the AK-47 and put it on steroids. It has really good stopping power because of the round it uses (5.56x45mm NATO). It has a 4 attachment rail on it, so its basically a customization machine. Very similar to the M4 Carbine, because it basically is a heavily modified M4. It was modified with the with the gas operating system from the HK-G36 for example. So I would say those two guns are the coolest in my opinion.