So you are getting ready for your new dream home and you start your search for that perfect plan. Hour upon hour is spent on the internet, searching through literally millions of home plans. You like the bath on this plan, but the rest is out of the question. Maybe the exterior of this other home is "sort of like" what you want, but it just doesn't pop. You see that the site offers changes, but exactly what you will get and how much it will cost is a mystery.
I have heard this story hundreds of times over the years. I am used to seeing a dilapidated printout of a plan (or several) from the internet with marks all over it. It is convenient for the customer to get their ideas from these plans sites, but that is about it.
When comes down to brass tacks, it is imperative that you have a living, breathing designer that will make the changes exactly as you want and not charge you any more for it. You need a capable designer who will work with you throughout the process to help you reach you vision. He should be willing to stay with the process and make as many iterations as it takes to get you that perfect plan.
That is exactly what I do.