ah well... there is an issue...
I just looked at the 150...
... and I wouldn't use it... for only ONE reason... it is USB from the converter to the 'puter. USB is fine for bursty stuff - but for video, it isn't the best way to go - and I don't think iMovie will recognize it.
Canopus makes good stuff
The ADVC 110 or 300 look good because they are bi-directional - but you may not need that and the 55 may be appropriate.