Hi Vin,
For the MS series of connector you are looking at (MS27656T13F35S or P, which is actually a MIL-C-38999 Series connector) - check here.
http://www.newark.com/jsp/search/pro...sp?SKU=91C3824
Open the Data Sheet link at the bottom of the page and look on page 3 of the PDF doc (page 117 of the Cannon catalog lower right corner) for the different configs of that connector that are available. I'm not sure how many wire connects you need - and the gage for each required, but if you scan through you should be able to find the one that matches your needs and pick that part number.
See catalog page 132 for the contact arrangements
See catalog page 134 for the pin part numbers for the wire gage you want (looks like 12 is largest they go for pins/sockets in this product line).
Looks like most of the S or P bodies are about 50 bucks. Then you will need a 'backshell' for both sides.
Hit Newark with the part numbers and you'll see their on-line prices.
Here's one of my current vendors on connectors:
http://www.wingselectrosales.com/connectors.html