40D, or...?

[Josh66]

with the ringflash you can set each tube to a different power output [...]

Didn't know you could do that, but it makes sense now.

I think I'm decided on the ring flash... I only have one more question.

How will it work with my 10s (35mm)? I think it was meant to use the older EZ series flashes, will the newer EX series work with it? I tried searching, but maybe I'm not using the right terms... Will I have to use the flash in manual mode with it (no TTL)? I guess that's not really a problem, and it won't stop me from buying it. Just want to know what to expect.