You've been given some good responses to your question and are absolutely correct in wanting to compare. That's the whole idea behind comparables. If the home you are considering per square foot is higher than an "identical one" that sold recently, then you might consider offering a lower price. Finding that "identical" is the hard part. As previous answers mentioned, the condition of the one you are considering may be superior to the "identical" one that sold, with upgraded kitchen, bath and floors. Also, the extra footage you may be looking at, may serve your needs best and be worth a little extra to you.
It's a buyer's market and this may play a part in your offer, but know that if this home works well for you and is priced competitively, someone else may find it fits their needs well too. An experienced Realtor will be able to help you through the negotiation process. In fact, if you have another property you are interested in, it helps to give you some "emotional distance" for selecting another property if this deal doesn't happen. Buying a home is emotional though, so don't let a few dollars keep you from getting the home you want. With interest rates so low, a few dollars should not make much difference in your note.
Congratulations on your decision to purchase a new home. It's a GREAT time to buy!