SS/FA. SS/WP is a good farmer on a budget, SS/SD is good but not as good as SS/FA.
Support Guides for all Corruptor secondaries and Fortunatas
The Melee Teaming Guide for Melee Mans
The Melee Teaming Guide for Melee Mans
Funny I would have said SS/FA is good, but not as good as SS/SD. But I guess it's an old debate, and it's really close anyway. Both are great choices, and fun to play with. I think SS/FA is even the most fun pick of both here, it's a bit harder to build well than a SS/SD survivability wise though.
Yea so basicly, anything with SS/ can farm. Once you add Elec Fences and Lightning Ball, with enough recharge, you turn into an AoE machine. The secondaries adding damage, like SD, FA, Elec are the best matches obviously. (One could also consider /Dark, but it adds some endurance issues on top of SS's endurance hunger, /Stone is possible too if you want to lead very tough farms, like +4 bosses, but Granite lowers your recharge).
/WP is a good straight out of the box set, doesnt require alot of investment to shine, gives more regen while you have more critters surrounding you, that's why it's popular too. A SS/WP works well with only SOs or cheap IO sets, and that's not as well the case of other pairings. But once you factor in IO builds, of course the other secondaries adding some damage will make better farmers.
Good luck 
Completely IO'd out, what would be the best SS brute farmer?
I'm mainly looking at /wp and /sd but would consider others too.