If you try to use a website to trade bitcoin then your risk is very high that you get scammed as there are a huge number of scam sites that deal in bitcoin
What about xmlgold. Its a really legit site i ever seen with lowest fees, I used this site few time and im in love with this site and now i recommend this site to every. This site manager is also there is donated 50 BTC to bitcointalk forum ,I think they will not scam us, What you say?
I really can't say if they are legit or not, however even if the escrow site is legit, it is very easy to trick escrow sites into siding with you. Your best bet would probably be to use a reputable person to act as escrow on the forum IMO