Because you already have the Octo skimmer, I think you might be best served with dual skimmers combining to your recommended size so that if one goes down, you are not totally without skimming.
In that case, you have a lot more choices, like a smaller BK (still a little pricey) or maybe the CAT3 Hurricone.
Alternatively, people have been happy with their Aquamedic T5000's for a long time. Here's a link to the twin version for 1250G tanks.
http://www.aquacave.com/turboflotor-...edic-1060.html
Aquacave ships to Canada happily and their customer service has been quite good for me.
*edit*
Here's a link for another company making big skimmers that I've heard okay things about.
http://www.marinetechnical.com/page2.html