Can you recommend a soft BULKY acrylic yarn???

[knitcindy]

What are some nice, soft bulky acrylic yarns that you have used and liked?? I want to make this sweater:

http://www.ravelry.com/patterns/libr...r-shawl-collar

And it uses bulky yarn. I need acrylic due to family allergies to anything coming from an animal. So, if you love a BULKY acrylic give it a shout-out here!!!

Question #2 - Would I be able to use 2 strands of worsted weight to equal the bulky?? In case I don't find a bulky in a color I like.

THANKS!!!!!!!!!
knitcindy