I am in similar situation. When I asked around, people including my lawyer discouraged me from concurrent filing of I140 and I485 as there is some risk of loosing the filing fee for I485 in case your I140 gets denied. So, unless there is an urgent need to get EAD or travel document, I wouldn't advise to file I485 before your I140 gets approved. That said, if you are willing to take the gamble, it might be a good idea to file I 485 concurrently because there is a chance (it's not certain) that USCIS will process your I485 sooner.