That looks great!!
The plastic ones are fine, but I've heard that some of the silk plants that you can get at craft stores and stuff will start to bleed the dye if they get wet, which isn't good since you have to spray cresties so much! I believe that you can boil them to get all of the bleeding dye out though.
You must be excited! Do you know if you have a particular morph you are going for? I was just at the show yesterday, and I got tons of awesome stuff for my crestie's live planted tank. I want another gecko so bad LOL.