Not a bad idea for a list. I've got a couple questions/issues-
Why a succubus in particular? If you wanted a cheap HQ distraction warlord, a Blaster Archon with his 2++ is a cheaper option that puts out more oomph while being able to play more conservatively.
Also, are you dedicating a Venom to the Succubus? I'm not a huge fan of a dedicated Venom transport for just one unit - that Venom costs 80/95 points, and doesn't really put out enough oomph on its own to be worth it IMO.
If you wanted to consolidate some points/transports and add a little more anti-MEQ to your list, I'd suggest the following:
Drop the Succubus in favor of an Archon w/ Agonizer/Blaster
Drop the Succubus' venom.
Change out one Trueborn squad for a squad of 9 kabs with a Blaster. Throw the Archon with them in a dissie Raider.
Before, you were paying 375 points for Succubus and her Venom, and Trueborn and their Venom. The result was one blast pistol, 6 Splinter Cannons, 2 splinter rifles, 1 Blaster.
With the new setup of Kabs/Archon, for 301 points you get 2 Blaster, 1 Disse, 8 rifles, and objective secured.
Also the same points value to throw the existing squad of trueborn into a Raider with the Archon. You get 2 Splinter Cannons, 2 Splinter rifles, 2 Blasters, and 1 Dissie.
The two latter are functionally equivalent at 18" in terms of shooting.
Also, keep in mind with the Incubi that 10 Mandrakes is going to do more against both MEQ and GEQ than 5 incubi in a Venom. you can save more points if you go that route.
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