why is it that when every person lower than the age of 15 on these forums (with exceptions) aren't creative enough to think of a name, so they get a word and put "scape" after it? Yes dante, I'm talking to you.
Anyway,
just get yourself a free host with PHP and MySQL, upload the software via FTP, and customize it to what you want. For the "Donator" ranks, all you have to do is create a new rank / group in the admin panel and add an image to it.
Also much better getting a host because you can then edit the forum pages to contain things that aren't there by default. For example, when Cruel used PHPBB, he edited it to contain a bar that said "Upload to Jotti" and a bar that said "Search forum". (Unless it was a mod, but I hadn't seen any mods of the like).