This is an interesting question - in the last 3 or 4 years, myself and members of my family have purchased 3 new build homes so I know all about the little irritants that prop up over the course of the first couple of years. Note that with the warranty there are 3 major components in the first year where you can make note of faulty items: a) PDI (pre-delivery), b) after 30 days, c) after 12 months.
I have spoken to a few agents/home inspectors and they all have varying opinions on how to handle the home inspection. I highly recommend getting a home inspection - yes - the question is WHEN.
a) PDI - you are going through the home with a representative of the builder. I have spoken to a number of home inspectors that have said that it's sometimes difficult to be very thorough when the builders representative is moving things along. While officially there is nothing saying that you can't bring along a home inspector, it's similar to when you view a property and the entire family is in the dining room having family dinner. It makes the buyers feel uncomfortable and sure you can look around but you're not getting the same effect.
Since the PDI is usually so close to closing, major items will likely not be done before you move in (we moved into one house where an entire kitchen was installed after we moved in...). During the PDI, the builders representative will often point out minor issues to make you feel like he's "on your side", but don't be afraid to let your voice be heard if you feel something is wrong. The last PDI we did had over 150 items on it (it was just one thing after another...). The one before that had just 20. I'm going to be a pain and NOT tell you who the builders for each respective PDI were....
b) 30 day point or 12 month point: this allows you to take your time to go through the home with your home inspector in much more detail. I have always gotten my home inspection at the 12 month mark, which allows the house to go through all 4 seasons and the house will have set.
Remember, your home inspector is not there to point out the visual flaws such as nicks and scratches on your hardwood floor - he's there to test the integrity of the house behind the scenes such as insulation, electrical, grading.