This thread is pure lulz... 500BTC/$2000(at current prices) to develop a full fledged forum software...
yeah, right...

Or you get someone to do it and it will be utter crap.
Why do people around here want to reinvent the wheel is something i always wondered.
On the other hand, if what you want is end up with something like
http://bitcoinweekly.com/ ok, code it from scratch...