G'day Ian,
Any specific reason why you want to have a two piece? If it is for ease of travel (eg backpack, pushbike etc) then that is fair enough but in all cases a one piece will be stronger and perform / feel better I reckon.
As for the rods, I use either a 6-10kg Shimano T-Curve (6ft1") or a 10-12kg G Loomis IMX (6ft6") using a Calcutta 200B but they would probably be suitable with the 400 as well. I have successfully used both of these outfits chasing barra up north and in the impoundments (yet to get a real horse though).
Hope this helps mate
Murph