You should look at specs. Higher model is faster, higher capacity toners, rated for higher duty, has optional paper holders.
Thanks for the response; looked at the specs on buy.com website earlier (didnt find much difference). Looked on samsung website and noticed the differences.
I am just looking for a laser printer that can replace my Inkjet that i dont use it for daily use. I think, i am good with 2955ND as I dont do heavy duty printing.