A few quick things:
-How will this army kill landraiders? I ask because they are now worth their points due to their toughness so your going to see a lot more of them.
-Love the mortars! They can cause a ton of saves a turn.
-Flamer sentinels against MEQ=Dead Sentinels. with the 2 hellhounds you have already i'd probably drop the sponsons on the BT, drop the Demolisher lascannon to a heavy bolter and then find a few more points and upgrade the sentinels to lascannons.
-that or take drop troops and find a way to fit in small units of vets or stormtroopers to land and melta tanks. the new DS rules are pretty forgiving now (as in you don't lose your squad as easily)
Just a few quick points
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