Your builder, I would guess, gets a nice discount when he buys all from the same make. "Throwing in" an appliance when you buy two or three isn't unheard of.

Read the matchy-matchy thread here as to why, then enjoy the process of picking individual appliances that meet your needs, rather that the desires of your builder.

Here is a link that might be useful: Matchy-matchy appliances

The one Viking appliance I would carefully research is the fridge - they've had some disasters over the years although the current model may be better.

The viking refrigerator saga continues

I was not clear, I am handling the appliance purchase myself so the builder has no "dog in the hunt". I brought the Viking package up (as well as others) and he suggested the Viking for its performance and "eye candy" appeal".