i think 350 is better, oh and if you want you can give us 400 also ...

no but seriously, 300 would be reasonable wouldnt it? you said minimum would be 350, but it doesnt mean anyone will be at minimum, and even if they were they would have 50 cards on us.
Also, 240 is the exact number for 30 card decks for each of us... so we would have the build the vault the exact decks we will use?