Neraph/seraph with base ready to start painting.
Seraph all the way. Slipstream is just an awesome animus to have and the strafe shot is also good. If you use the seraph with pVayl (and you really should), the extra 2 inches on turn one (for incite), as well as a leashed and slipstreamed typhoon / scythean can make a lot of people sad.
I've been looking at the harriers also, there some fun synergys with them.
Harriers are great, but I prefer spawning them from the Vessel instead of paying points for them.
I've got one of those