I'm thinking Egwene is too central to be a (successful) target for this, and the Aes Sedai with Taim too peripheral. Tuon as well would be too central to turn dark, and with the prophecy remaining about her and Rand... I just don't think it would work.

(This not to say that one of the above might not be *attempted*, or that some of the AS with Taim might be turned as a side story).

One more likely candidate might be Alanna. The implications of her bond with Rand would make this quite interesting. Another possibility would be Cadsuane... the end of her life has been repeatedly forshadowed, and while I don't see the direct reasoning for her it would be an interesting twist after she's taught Rand tears. Other ideas? Mmm... one of Rand's closer Asha'man, Leane, Lelaine, or a couple White Tower Sitters.

Most likely, however, will be the escaped Black Ajah seeking this technique to bolster their numbers in the days leading up to Tarmon Gaidon. I don't think they will try to re-infiltrate to the WT too much (maybe a little) at this point, but will rather seek to raise an army of Dark channellers. This would be an ideal method, as it would be easy for Travelling Black Ajah members to capture and convert isolated Aes Sedai...