the other thing to remember about the crusader is that you can't attatch it as a dedicated transport
i agree about going for more tactical marines, and i'd also bump those bolter scout upto a full unit of 10, or else drop the power fist altogether... (you won't get the milage out of it like the tac squad on!)
i'd also add another marine into the command squad as your commander doesn't count for scoring unit purposes as he's still an IC!
some more heavy support is also in order simply because preds are such a great option due to their flexability!
the main problem you're going to find with those assault termies is that with only 1 deep striking unit, it'll be mostly unsupported and thus is going to attract *alot* of attention!
a drop podding tac squad as well as a drop pod for the dread would really help the termies survive being so close to enemy lines!
hope this helps,
cheers!