You may have to pay extra for this. Ask the developer for the name and number of a homeowner in the development who bought a home with the standard finishes. Call and ask if you can take a look. Before you agree to pay for upgrades, find out how much the developer will charge. Then do some comparison shopping on your own to find out how much it would cost you to buy the upgrades yourself.
Some developers add a huge mark-up for upgrades.
If this is the case, you might be better off by having the home completed with the standard finishes and installing upgrades at your own expense later. Making changes can be a nightmare depending on the development. Most developers are only set up to provide the standard product and a limited number of upgrades. Any deviation from this may not be possible, except for an exorbitant cost. It may be easier and less expensive to have your own contractor make the changes you want after the home is completed.