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Pretty soon now I'll be making a a 30k Thousand Sons/40k Space Marine force with 3 Tac Squads, 2 five man Assault squads, 2 five man Devistator squads, and one Veteran Squad. However, I'm at a little bit of a loss as to what Special/Heavy Weapons to equip each squad with. I'm thinking Missile Launchers and Lascannons for the Devistators, and Flamers for the Assault squads (provided they can take them), but I'm at a loss for the Vets and Tacs. I want all bases covered, and Combi-Weapons seem appealing if expensive, not sure about Plasma as I'll be getting Hellblasters for when I play Space Marines, and I'm not sure what the advantages are for taking Meltas if I have Missile Launchers and Lascannons (besides cost if I decide not to take the latter two).

Any suggestions?

Classically, you choose the marksmen veteran tactic and take a pair of suspensor web heavy bolters on a veteran tactical squad. This is pretty lethal with asphyx bolts.
However, combi-meltas and machine killers is a viable choice.