phpbb is a software script you install, it is completely separate of blue voda, and is not something that you can edit with BV.
Vbulletin would have to be manually installed. Its a pay script, so you would have to purchase a license first (
http://vbulletin.com).
You are also getting php and phpbb confused. PHP is a programming language, phhbb is a bulletin board programming in PHP.
D3jsp has several mods installed on its forum (its running phpbb2). Offhand looking at the site they have these mods installed:
Some type of portal mod
Chat mod
Warning system
Forum gold
An announcement system
some sort of clan management system
Now I can't really go into indepth detail of finding/installing all of these mods, here is a link to a good search for mod/hack sites for phpbb2
http://www.google.com/#hl=en&ei=oycgSrQioL63B7CsnckG&sa=X&oi=spell&resnu m=0&ct=result&cd=1&q=phpbb2+(mods+OR+hacks)&spell= 1&fp=2Inaafc1UxE
If your going to run phpbb3 change the google search accordingly.
The cost for someone to do these upgrades would vary greatly on who is doing the job. You can probably find someone to install of a bunch of mods relatively cheaply ($100-$200). Now I would make sure you either have your templates modified or install one you download before you go about installing mods. Mods generally have two sides, the backend (the php code/database modifications) and the frontend (the template modifications). If you install all of the mods and then go about changing the look you will be basically reinstalling half of each mod you have installed.
Finally... to make sure your not confused on this. BlueVoda is a webpage generator, not editor. NOTHING you install on your website (such as a forum, blog, cms, calendar, portal, etc) can be modified using BV. All of these types of things are hand coded, and can only be modified the same way. The closest you will get an easy template modification is a website such as
Colorize It, which will dynamically change the colors of a few predefined templates they have available at their website.
Oh, and I'm just wondering, what game are you making your trade forum for?