Quick note on optical converter for Inon. As far as dSLR goes, as nikonos bulkhead and 5 wire configuration is the standard but the number of wires connected is not (you don't need all 5 wires unless you are using for example iTTL compatible strobe with D70 ie housed SB800) so depending on housing manufacturers, some will have all 5 wires connected while some won't (and some such as Subal comes with 2 bulkheads, one with 5 wires and one with 3 wires).
As far as I know, Inon Optical Converter will work with Nexus housing, not with Sea and Sea, not compatible with Ikelite (different bulkhead) and my guess would be that it would work with Subal. Most dSLR housing also won't let you use internal flash to trigger the strobe so if you go dSLR route, you will most likely have to upgrade the strobes as well unless you stick with Nexus (which is an excellent housing, by the way).
