There's a fair few quality front rowers in the Chiefs region this year, and also in the Canes region too. Taumalolo (Hawkes Bay) could come up in the draft, or Tony Penn (Taranaki), or Perenise or Jacob Ellison (Wellington) or one of Simms Davidson or Ben Castle (BOP).
Lots of Locks floating around the Canes region too. Craig Clarke or Jared Hoeata (Taranaki), Triggs from (Manawatu), Eagen from (Hawkes Bay), Thrush or Upton (Wellington).
Jack McPhee (North Harbour) would be the 5/8th I'd target if I was Highlanders coach. Or maybe David Howell (Northland).
But they do have some home based options in Blair Stewart, Callum Bruce, Charlie Hore or James Wilson. But none of these are capable of filling the place left by the All Black 5/8 though.
Edit: The position of both Otago (7th) and Southland (5th) in the Air NZ Cup has got to be a good sign for the 2008 Highlanders. The Chiefs don't look so good, with BOP (13th) and Counties (14th). But then Waikato (6th) has 4 All Blacks away. Not counting Kelleher, who isn't returning.