Hey Noki,
Entry #4 is pretty interesting. It hints at a smiling face which is pretty neat. Is there a way it could possibly incorporate two f's within the box - to symbolise the fact that fundsforum is about communicating with others (the experts in particular). Might get a bit crowded perhaps. I guess the two f's wouldn't have to be the same size - or could be in different colours. Anyway, just a thought...
On reflection, I reckon entry #4 outshines entry #6 except perhaps for the business name. I like the idea that the two words are in different colours.\
Thanks for the design.