I disagree with the poster above. I think Larsson will have a great opportunity in NJ to rack up the points and I think he's going to develop into a STAR defenseman. I'd take him out of everyone there without even second guessing myself.
I think Horton should be ranked higher, even considering it is an expansion draft.
Power forwards take longer to develop, and Horton is just hitting his stride at a relatively young age. Should be good for 70+ pts for many years to come. Not to mention, great trade bait for future 1sts.
As a Kings fan, I'd say definitely stay away from Moller. He's skilled but unless he gets traded, he won't play in the NHL. He's also playing in Sweden this year so theres a possibility he never returns to NA. Off of your list above, I'd probably take Brassard.