baddpix

I want to add a second DS-125 strobe to my existing setup (Canon 20D, Ikelite housing and single DS-125 strobe with sync cord).

Ikelite offer these options:
             A : dual sync cord
             B : manual controller with slave sensor
             C : wireless digital TTL slave sensor

Any opinions/recommendations/experience about these?

Ikelite's website says that C is not fast enough for TTL on current digital cameras.  It also says that A is not necessarily more reliable than B.

How useful/important is TTL on the second strobe?

Any advice welcome.