I have a concrete sink, wish I had found a double. A couple weeks ago I saw a porcelain double with drain trays for sale. I'm still thinking about it but I'd have to build a stand/cabinet and redo my plumbing for it.Go for broke, go concrete!
I was seriously going to free cycle the concrete sink that was in my house until we tried to remove it from the basement. Once I decided that we were risking real bodily harm trying to get it out in one piece I went to plan B. Plan B involved a 3lb hammer and taking it up in parts.
The replacement cheapest plastic sink from Lowes was carried down the stairs with one hand. It does work but I would prefer a more stable base. Otherwise I'm fine with plastic. I don't care if it doesn't look as nice as stainless.