I did a shawl in Suri Dream and it turned out quite nice. I think it fits your bill - warm, cheap, lightweight - and I bet it would look great in the pattern you're looking at. It feels like a more expensive yarn than it is. My shawl used 4 balls, which means it only cost $16!
I would recommend needles with sharp points if you go with the Suri Dream. I used Addis, which are blunter, and sometimes found it frustrating trying to slip the yarn onto the needle quickly.