I have been trying to find a place to get a short chain that was rated more than my little 5/16" 4700lb chain and wasn't going to cost me a fortune. I was actually able to find a local place that had a large selection and excellent prices. I dropped in and told the guy what I was looking for and he took me into the warehouse and gave me all my options. They have a bunch of sizes from grade 70 to 100. I ended up going to 3/8" grade 100 with grab hooks rated for 8800 lbs. To get closer to the 12k lb rating for the winch would require 1/2" and it's huge and would be tough to work with. I think the 8800lb chain will be plenty. I asked for 8' and he happened to have a 12' piece that he sold me for the price of 8' so he didn't have to cut it. Total amount was only $55!
They also have an assortment of other recovery stuff at good prices. The same 1" shackle that I just paid $22 for, they have for $15. They are great people and I will definitely be using them for all my future rigging needs. Not sure how bad shipping will be on the heavy stuff, but definitely check them out!
http://www.tulsachain.com/