Check out on the list:

Dorian Chant
Acropolis
Knightly Procession


Older
Dance Celebration (A little tougher than it looks)


For marches:
Base Camp March (Castorena) was my fall back this year and worked great.
March of the Syncopated Penguins is a little tougher, but kids like it.

I've done these with our NV 1C, which I assume would probably be similar to your SNV.