Welcome to NamePros.
Based upon the stats for this name the offer seems fair at this point in time. Chances of a second offer anytime soon could be a rare feat. However, if you are a risk taker and enjoy the barter process, there is nothing wrong with a counter offer in the mid $xxx range, as most first offers are low to begin with. Choose your bottom line between the two amounts and bargain to that price.
:imho:
Best of luck and congrats on the sale.
-Regards