Hi there,Pooley is absolutly right. Ikelite SLR housings are not enable to use optical strobe connections therefore you wont be able to trigger any optical unit. This rules out the S&S YS01, YS02 and Inon S2000 and D2000
You are left with Ikelite own strobes. S&S YS D-1 and YS 250 and the Inon Z240.
Only Ikelite strobes will give you TTL because the housing has a built in TTL converter that allows you to control the strobe from the back of the housing.
The DS160 and 161 are very powerful and very fast but incredibly heavy and use a rather big battery pack.
The S&S YS D1 is a great option. is as powerful as the ikelite DS160 but is much lighter and uses regular AA batteries.
The Inon Z240 is one of the more popular strobes out there and it will perform perfectly, The downside is the price, compared to the YS D1, the S&S option is more powerful and cheaper.
With either of this 2 strobes you will need the S&S Syncro cord.
The Ikeilte DS51 is a small unit but pretty useless for wide angle, is under powered and has a very narrow beam.