So this week I've tried the TDK BA200, the PFE 232 and the CK100Pro. As of this moment, the PFE232 are going to be the ones I stick with. The CK100Pro, while good, didn't seem worth the additional price over a used set of CK10s I could buy, nor did I absolutely love their sound signature. They also had the fussiest fit, as a result of their slightly larger housing and moving piece.
The TDK's will probably be kept and used as my gym/portable pair, as I quite enjoy their more laid back (though at times muddy) presentation. They also fit me well, which is a plus. I'm sort of wondering if I shouldn't try outthe lower end PFE models before I decide on the BA200s as my portable IEMs, though.
The PFE232 just seem to be the best sounding of all four of the IEMs currently in contention and will therefore stay as my personal "flagship" IEM.
I have a few more IEMs I'd like to try, however. They include: Sony EX1000, JVC Fx700, V-Sonic GR07, Rhapsodio R^2, PFE012, PFE 122, PFE 112