what amp under a grand?

Nice amp and built at the Marantz reference factory in Japan. Has the "Power Amp Direct" feature that essentially turns it into a power amp that you control with AVR's volume knob when listening to surround sources. Push the button to disengage and you control the volume with the integrated amps knob for 2 channel. It will match up well with your VA Mozart Grands. Let us know how it works out.

will the marantz pm8004 have enough juice to give the mozarts a kick?

Unless you're filling up an auditorium with sound, no problem. Your Mozarts are the same as my Bachs - 4 Ohms with a sensitivity of 90 dbw. The PM8004 is a high current amp putting out a true 100 wpc into 4 Ohms. My PM15S2 puts out 140 wpc into 4 Ohms. The difference between 100 and 140 is negligible.

It will make your Mozarts sing with no problem.

Well, that is one view and I respect it. Another view is you need more power to open up the speaker, not just to get it loud. I think a 70 watt amp is not ideal for this speaker based on my experience. Sure it will play the speakers very loud, as loud as you ever would want. A more powerful amp will open them up more and play them with a greater sense of space and ease.

Specs can be very, very deceiving and these speakers like power.
Also, do not partner these speakers with an amp that has any tendency towards darkness.

You want a great integrated for these? The Bel Canto i300. It is 150 watts per channel and the speakers drink it up! It is not dark and very fast.

what would the bel canto i300 cost new or used? i can get a used marantz pm 8004 for 350. but i do think in my situation an integrated amp with ht bypass is the way to go.my system is for family as well, used for movies and gaming.if it was just for me an avr would not be in the picture!