Which of the following snowboards would be good for a beginner?

Ok, well first of all, Burtons are not the best boards. They are just the most well known. I am at work, so the sites above are blocked on my computer, but I would recomend going with K2 if it is a pretty recent board. Some other brands you should look at are Rome, Lib Tech, Signal, Stepchild, DC, GNU, Forum, Bataleon, etc.