It appears as if more spec homes are being built now than in the recent past. If that is so, it is very likely that you will be able to find the model you want on a lot that is what you are looking for.
I say this only because only spec homes and NO build for people homes were offered in 2008 when we were looking for our first home here and there were good choices in a variety of upgrades and lots for the model we wanted. And that changed daily.
I don't know and I don't have up to date info.
Jimbo is the walking book on all of this!