Thank for your reply! In next days I think I'll purchase vBulletin board
But I don't link the style of last vBulletin version 4.0.x ... it's very different from layout of 3.8.x version!
Now I want to ask: how can I have the style of 3.8.x version? Do I have to download 3.8.x (if it is possible, I don't know!)? Or are there some themes that make version 4.0.x layout very similar to 3.8.x version?
Thanks for your replies!