Good luck! I've bought the majority of the 5870s and 5850s in the area!
Haha,
Theres a few good links I saw on Kijiji that were a little out of reach for me(I'm in hamilton), that you might consider going to get. Ill see if I can dig them up.
I think one was a computer already running two 5870s or 5850s(can't remember) in whitby or something and I don't think hes a miner, just wants to sell his computer with them. It would be a great start.