While I will agree that a Liquifier is the best shooting option for a Haemi, if you have pathfinders, joining him to them with a Hexrilfe could be fun. Remember, snipe rifles have precision shot, so there is a chance that you could allocate his shot to important models in enemy units.
Also if you plan on getting (or rather making) an Aegis defense line, Wracks make a good option for this.
If you decide to go cheaper, I would buy a set of Wracks, convert 1 to be a Haemi and do the above.