Against Blood Angels, pretty much the only tank you will find is the Baal Predator (along with plenty of Rhinos). I would label that as high priority as those will chew up your infantry and Grenadiers.
That said, I do know of goons who would put a Land Raider in 1000pts... So I'll say keep the Melta Vets for Deepstrike / Outflank purposes. (that would mean gettin' Droptroops there boss
) Those guys can also go Baal hunting.
I echo everyone in saying that the command squad is better off as a plasma squad. Deepstriking could be considered as it allows you to hide your command squad from shooting for a while, and also allows you to get within rapid fire range of targets of opportunity, but I hesitate as well as the randomness of deepstriking is still there, not to mention being too close to the Blood Angels for comfort. So it's your choice
Oh, and try to get Hull Heavy Flamers on your Chimeras. Those do more damage than a Multilaser in optimal range...