Substituting yarn?

I could use some advise here. I want to knit a cardigan for my grandfather for Christmas. It's the Man's Cardigan from A close-knit Family by Melissa Leapman (I found this book at a great deal at a local bookstore). For the Cardigan I need Tahki Import's Donegal Tweed. I found the yarn online without any problems, but the big problem is the yarn can't be washed in the machine. Yeah, that's a big problem as my grandmother will not take the time to wash something by hand, she'll just throw everything in the machine and wash it together. I don't want to take that risk and so am looking for a superwash yarn I can use instead. I'm usually quite easygoing as for substituting yarn, but this is the first cardigan I'll be knitting (so far only socks, scarfs and mittens :D). I'm not worried about the knitting, I just want to make sure I take a proper yarn for my first big project! :D

So please, throw suggestions my way! Oh, and the yarn should be available in darker tones, not the bright ones. As far as I know my grandfather only wears greys, blues and dark greens. And I don't want to give him something he'll never wear.

Thanks all!