Its really up to personal preference. I learned how to avoid LRMs just by shutting down or running behind cover, so I'd go with the DHS. But who knows? Maybe someone wants to help their team or run across without worry about getting too much damage.
This is how i use my 7K. It has only a 275XL but 400 Missiles and a better heat eff. Nice machine... it makes fun and is cheap to build.
I just got this guy with the sale going on this weekend. I've been really liking a pretty similar build, using an ER large and adding artemis, at the cost of the medium lasers and heatsinks. I put a flamer in the head to annoy the jank out of people in close range combat -- it has also netted me a few crit kills similar to a machine gun, but I would probably swap it out for something else if you aren't going for the flamer's obscuring the enemy vision properties.
