I would still decorate. The decoration may draw more people to your house. We had ours up for sale last year throught he holidays and we had some people request a showing of our house because they liked how the outside of the house looked all decorated for the holidays. We decorated for the fall/halloween (nothing scary) and for Christmas. You can still decorate without it looking cluttered.
We didn't sell the house and actually we are glad we didn't, we like our house and neighborhood. We almost had it sold though, instead we are staying put and have an addition put on.