Colossus Siege Mortar

Str 6 AP 3 large blast... and ignores cover. SPACE MARINE KILLER :D
So my iron warriors, an army I've collected recently, specialize in being awesome. and they take two colossus siege mortars. That means double force org, and double allies, but its so worth it it's ridiculous. When you combine the durability of space marines, albeit chaos ones, but still. Then you slap in the aegis defense line, and these colossi, and we're lookin at quite the formidable little force here. This means it's gotta be a 2000 point list, but that's totally fine with me, thats standard these days, at least for me and my friends. So why the colossus? in short, it takes the most popular army in the game, and brings it to its knees. Also, I have access to guardsmen, which means plasma spam. Not to mention the list has a vindicator, so when you add those and my plasmacannon toting Helbrute, you get the answer to enemy terminators, and my obliterators make short work of landraiders, so I'm not worried about those either, so I don't need any other type of artillery. And lets face it, bigger is better, and the colossus is the biggest there is when it comes to cannons :D its something my opponent would be foolish not to deal with, regardless of the army they wield. AP 3 strength 6 deals with any standard troop in the game with ease. And since they're sitting so snuggly behind my aegis defense line, well, as the youth are so fond of saying: COME AT ME BRO!