All the advice so far is great but in the sense of just a simple paint color, most buyers are savvy enough to overlook this detail in consideration for the house they want. The aesthetics all come down to personal preference, unless of course were talking Pepto Bismol pink contrasting with navy blue and polka dots. The real concentration should be focused on the other such spruces. If you've only done part of the house and it does not really win you over, than get it changed now before it really becomes an eyesore. It's always a good rule of thumb to use neutral colors with either a slight contrasting trim or a strong contrasting trim. The sure fire way to determine if it will indeed affect the resale of the home however is to step outside and look down each side of the street. Do you stick out like a sore thumb or add a nice compliment and blend to the homes around you?