It would almost have to be either really good TCCD or really good BH-UTT to be able to hit 233 at 2-2-2-5 with only 2.5v. Heck, I sure don't have any TCCD or Winbond that will do that, either the Winbond needs more juice, or the TCCD needs relaxed timings.
Of the two I would say new bh would be the most likely, the most plentiful and the least expensive.
I have to admit, my interest in these is rising. Could the PC4000 with 2.5-3-3-6 be using Hynix D5 chips like the OCZ PC3700 Gold Rev 3 uses? For $150 or so, shipped, that looks pretty good too for an Intel rig.
Edit:
Scratch that Intel stuff, these are rated for an AMD rig. Must be TCCD...what do we know about TCC5 (Rev F)?. I've read where one of the G.Skill guys, talking about TCC5 stated that the "F" is better than the "E" revision, but other than that I've heard little about these chips.
Must resist...