Hi Wolf, bit of give and take both ways really, the Dogs are fine with Cats, and it's a Kitten we're looking for (no great rush) so it will grow up with Dogs around it so there shouldn't be any problems.
I am sure it will work out. Kittens are amusing and exhausting. Your dog's seem pretty laid back and well behaved - I am sure that the demon kitten will take advantage of this.
We only had one Dog (neither of the ones we have now) when we got the Cat we lost last January as a 7 wk old Kitten. The Dog was 10ish at the time and from day one became the Kittens Play Centre, he was ambushed, ridden used as a comfy bed and generally abused, never had a problem.