I just purchased the German 10000Ks, Ushio I think the name is, and I like them a lot. They are a much crisper white than coralife from what I hear, and coralife also has a much lower PAR than the Ushios. Someone posted a thread a while back that showed the different lighting of the different bulbs. Don't know where it is, but maybe someone else remembers it too.
If you are looking for intensity and crisp white, then you want the ushio or AB bulbs. If you want a metal halide actinic (worthless IMO) then the coralife or bluelines fit the bill.
I have actenic for dawn dusk...but with 2 175W Blueline 10K ran on Blueline balasts there is no need for the actinic. The bluelines add enough blue on there own to give a crisp white light and no yellow looking light.