I am facing very similar choices and here is my take...

The multi-contour seats are something you use everyday. Long trips, short trips etc. It is your back and butt comfort. Get them!

The nappa dash looks nice, but for $1900...I would either save the $$ or put it elsewhere unless price is not really a factor, but obviously it is to you since you are making trade offs. Besides, nappa seats with 2 kids is going to be wasted, if not made to look bad since it is softer and wears easier, especially with 2 car seats sitting on it...and food getting smashed into it

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