First things first, your points are off. The scouts at 230pts is wrong, I think you ment 130? And the Command Squad is wrong too. It should be 240. It looks like typos, as the correct numbers totals 1500.
As for the list, I think it's passable as it is. There are, however, a few things i'd do differently.
The idea of the scouts grabbing top floor objectives is good. But realistically, there isn't going to be many top floor objectives (if any). After all, you get to place around half of the objectives so if you place objectives outside, near a multi-floor ruin, that should deny the ability to place objectives inside the building. I'd keep one of the scout squads, but the other one could be dropped.
I'd also question the attack bikes. You could run 4 bikes + attack bike, saving you 21pts on a normal bike or 5 bikes saving you 55 points on the attack bike. I would probably go with option 2. I mean, with your fast moves and hit and run, you'd manage alright with getting up close. Besides, even if your melta's whiff (which, lets face it, they do), you have meltabombs, so the closer you get the easier the charge is.
Sternguard seem a little out of place in this list. I understand how compelling a melta suicide
DP unit is, but the plasma is wated. Plasma and Melta have very different targets. Identify these targets and decide which you want to kill. If you go with melta, i'd consider 2 meltaguns and 1 combi-melta. By definition, this suicide squad is going to die, so having
MGs that can be shot more than once forces the enemy to deal with them, and seeing as they cost the same why not just go for it? For that rare occassion they survive a round of fire.
How do you deal with anti-air? The dreaded hell-turkey will ruin your day. Maybe a Stormtalon could be included if a unit of scouts were removed.
Anyway, thats how I see it, I look forward to seeing where you go with the list
Zambro