I've been shooting with a Canon 550d in a Sea & Sea RDX-550d housing. Up until now, I've been doing mostly macro using a single Sea & Sea YS-110a strobe. I'm now cobbling together a used setup so I can shoot the Tokina 10-17 as well. If I can find one at a reasonable price, I'd like to add a second strobe, preferably a Sea & Sea YS-D1. Will there be any issues with this mixed strobe setup? As far as I can interpret the Sea & Sea charts, it should all work. I sometimes shoot in manual, but I often rely on TTL and would like for that to continue to work. The housing has 2 FO ports, so that part should be easy.
(and if you need to get rid of a YS-D1 for any reason, just let me know...)