No rules agreed on yet but I am definately leaning towards the All Things Zombie: Better Dead Than Zed rules as I fancy a campaign aspect to it and have already bought all the books! I also picked up the No More Room In Hell rules by Iron Ivan Games but have yet to read them. Andrew likes the look of Ambush Z by Ambush Alley too.
All Things Zombie
No More Room...
Of course there are a myriad of other options out there but we will look at these first!