Which of these three Bhaalspawns hold the most endgame potential?

Which of these Bhaalspawns hold the most potential in terms of power (playing all the way through the saga)? I know they are all excellent but I cannot decide which one I should first commit to playing. Note: They are all brand new and I haven't yet used any ability tomes.

Odion, my Half-Elf Dragon Disciple Sorcerer (I chose Half-Elf for the extra constitution which I hope to eventually get to 21 for the regen):

http://i1137.photobucket.com/albums/n511/Samuel_Rosenbalm/DD_zps3553c5a1.jpg

Ekklezius, my Elven Talos Priest:

http://i1137.photobucket.com/albums/n511/Samuel_Rosenbalm/TalosPriest_zps6708861c.jpg

Finrod, my Elven Archer (I will eventually get him the Gauntless of Archery as well as add the boots of speed and eventually add 2 extra DEX):

http://i1137.photobucket.com/albums/n511/Samuel_Rosenbalm/Finrod_zps23eba516.jpg