TTL circuitry that will work (with Ikelite DS strobes of course) on both the NEW Canon Rebel T1i and Rebel XSi camera.
I recently had a T1i in my hands for a day and think the HD capability is much simpler to initiate and use than the higher priced (although beautiful and more MP, etc.) Canon 5D MK II.
P.S. - If you already have an Ikelite Rebel XSi housing there is an upgrade program (at very modest cost) to get the extra video control and TTL circuitry upgrade so your housing will work with either camera.
Could you expand a bit on the TTL circuitry issue? I'm assuming that Ikelite has had to reverse-engineer the eTTL II protocol for the circuitry, but according to spec the 450D and 500D both use eTTL II? I probably wouldn't bother upgrading for the video control alone, or even accurate TTL as I expose manually 90% of the time, but camera lock-ups would be pretty inconvenient...
It seems some more testing is in order here. I already had the 450D housing in water with the 500D and the old video button is ergonomic enough for me, but didn't have time to test strobes.