Obviously you need a Lieutenant, and I guess a Hacker is important to learn (given everyone says Infowar is a big deal in N3), but beyond that I am kind of stumped. I have the Project: Icestorm box (currently slowly assembling the minis) but still have not decided what faction to play or identified what my play-style is (then again, after all these years I still do not know what my 40K play-style is either

, Custodier with Marker is nasty. Very good hacking options, marker expands your hacking range massively, and is a LT in ODD.
, try a Father-Knight hacker or those asshole drones in ODD.
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INTERVENTOR Hacker (Hacking Device Plus)
REVEREND CUSTODIER Hacker (Hacking Device Plus)
MOBILE BRIGADA
PROWLER
HELLCAT
INTRUDER
SPEKTR (Deployable Repeater)
ALGUACIL Paramedic (MediKit)
TOMCAT Doctor
MODERATOR
LUNOKHOD
REAKTION ZOND
JAGUAR
MORLOCK
REVEREND CUSTODIER Hacker (Hacking Device Plus) Lieutenant
PROWLER
MODERATOR
REVEREND MOIRA
SIN-EATER
ZERO (Deployable Repeater)
REVEREND HEALER
CHIMERA
3x PUPNIK
RIOT GRRL
ZONDCAT
ZERO (Minelayer)
TOMCAT
WILDCAT
TRANSDUCTOR ZOND
SALYUT (Minesweeper)
VALERYA GROMOZ Hacker (Hacking Device)
BANDIT Hacker (Assault Hacking Device)
DAKTARI
INTRUDER
ZONDBOT
MORAN
HECTOR Lieutenant
ACHILLES
NETROD
ALKÊ
THORAKITES
MYRMIDON
MYRMIDON (Chain of Command)