You might want to consider crochet thread. The number 10 is my favorite for actual crocheting. This is a search I did in Yahoo and found this at Joan's.
http://www.joann.com/needle-arts/kni...rochet-thread/
I found out the hard way that large openings in stitches is where dogs and cats get claws caught in and can pull the thread all out of shape. If it were me, I wouldn't use the large stitches unless it was a wall hanging or a table runner. Although if you have no animals, it's a moot point.