Single SS, large and deep. That's what I have and am really happy with it.

I also have single SS deep with pull out faucet. Love it. Use it for all kinds of things.

Another single SS sink vote! You might want to consider a D-sink as they are nice and large side to side, but also front to back. Here's the one we went with & I love it. I have soaked heavily soiled garments, washed delicates, and even gave the cat a bath in it!

Here is a link that might be useful: Luxart D-Sink

Ours was from Ikea and it was very deep - deep is better in a laundry room (IMO).

There are a couple others at Ikea now that are deep (ours is no longer available). My neighbor has the one on the link - it's really nice and deep.

http://www.ikea.com/us/en/catalog/products/S09872036/

Here is a link that might be useful: NUMER�R - Ikea SS laundry sink

I'm very happy with my SS single bowl with pull down faucet in the laundry room. : )

We're doing a single and sounds similar to what others have said, I am going with a stainless 9" depth. I also recommend a high faucet so you can fit a bucket under it or water plants, etc. and with a pull down sprayer to make cleaning easier and other such tasks:)