I think that it is a fairly well done list. You have a good stratigic base set up, but I would offer a one major change and perhaps a few minor ones.
I would not take the pathfinders, but instead another hammer head. I always infiltrate my stealth team into a position of obtuseness, and since they have nifty holo-cloaker-majiggers, I find that they can hold still for a turn to fire a marker light without being annihilated. The hammer head, depending on how you equipped it, would be cheaper (multi-tracker + disruption pod + rail gun + smart missiles = 2 points cheaper
), but more importantly, would provide you with a bit more anti-personel firepower. You have definitely got the field of anti-tank covered with the broadsides, but last tournament that I went to, the only game we lost (allied tournament, I was tau, my ally marines) was that we got swamped by a pesky ork mob. I was able to deal with the first gaunt brood (note, tyranid + ork = evil) and a war buggy, but after that got immobilized, and so our only source of descent anti-mass numbers was in the form of our attempts to will the models into nothingness, which of course didn't work that well. I would recommend a hammer head, and that's so you can get some more anti-mob bang.
Other than that, i would tweak the two groups of 10 warriors. Don't give them Shas'ui, which is kind of pointless, unless you are giving them markerlights or drones. Use the existing points to give the two Shas'ui in the groups of 12, since they form a static firing line, they will always be stationary. This will also help to keep any pesky tanks from getting too close (call in seeker missiles / accurate rail guns).
One last thing, but it doesn't really matter too much. Take one target lock on the broadsides and turn it into a multi-tracker, since he can fire at one target, his comrades at two different ones, so that kind of defeats the purpose of having a third target lock.
So, that's what I would do, but if you have success with the pathfinders or have had success in the past, let me know, since I've still got a fast attack slot open and am wondering what to do with it. Hope I was of some help to the greater good
!