We got quoted close to $150K for a pretty basic two story addition, small colonial in the same general area as you. We opted instead to do a really nice kitchen renovation that involved knocking out a wall to make our small kitchen and small dining room into one large eat in kitchen. It turned out really well. It cost $80K, but we could have gotten it done for less (got granite countertops, custom cabinets, etc.).
Renovating is really expensive. For us, because we bought when we did, it would not make sense to spend more than a certain amount on the house. Our neighbors spent $200K on their addition but paid 200K less for their house, so it made sense. You don't want to have the most expensive house in the neighborhood.
To this poster who renovated your kitchen, was this a recent reno? That seems like a good price. I'd be curious to know who you used, if you liked them, and how extensive the work was.