I also play Word Bearers and have run a similar list.
Overall, I think this list is a very good starting point that only needs some tweaks. Here are my recommendations.
I?ve played a Bloodthirster in my Word Bearers army to great success. Just point him at the most expensive unit and watch your opponent cringe!
If you want the BT, I would get rid of the Dark Apostle. No, it?s not as fluffy, but then every single WB army in existence doesn?t have to be led by a DA.
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I would say 6 packs of Daemonettes are still worth fielding because sometimes all you want them to do is hide so for 90 pts, that?s a great investment. Also, more daemon packs make for more reliable summoning. Of course, almost any amount of fire will destroy them. If you want more speed go for 2x6 Daemonettes and 6 Furies. These are fragile squads but the Deamonettes are still lethal and the Furies are there for tying up heavy weapons units or stealing objectives. I'd say this mix will win you more games as the Furies complement the Daemonettes and Bloodletters well.
I wouldn?t field a Rhino. Your Defiler has Indirect Fire so it will be hidden which leaves the Rhino as the only vehicle. It will likely get destroyed very quickly. I recommend giving this squad Infiltrate and making the Champ the DaemonHost. Give him Daemon Chains and no other upgrades.
I would give one other squad of marines Infiltrate to help position for daemon summoning.
A lot of people like 2 Obliterators because of the even number. I always field three. This way they throw out serious firepower and can lose one guy and still be a serious threat. I see two as okay if you don?t want to rely on them for firepower. If you just kill one in a two man unit they are neutered in my opinion.
I?m not a big fan of Defilers, but if you like it go for it.
I think you should have some points left over from the DA. I would get three bikes with two special weapons. (I like plasma) These guys are 125pts and are great for stealing objectives late in the game or pushing forward on turn 1 for summoning. They add a nice element of speed and surprise to your list, but you must play them cautiously (easier said than done!).
Absolutely field 2x special weapons in each squad (or 1 special and 1 heavy). I?d give the non-Daemonhost Champs BP/Powerfists.
I?ve run a list similar to yours with the recommended changes and it will do well against all armies. The Bikes will add speed as will the Infiltrate (when available). If you go with Furies, you will actually have a fast army! The marines will hold objectives and lay down support fire for the daemons. The Obliterators and Defiler will hammer from a distance. Your biggest weakness is likely hoardes. You should win the overwhelming majority of your games vs. marines.
Have Fun!
Gorthrax