I would size for 10 people, just in case the game grows.
I figure 3 full buy-ins per person on the craziest night.
3 x 10 x $200 = $6000
200 x $1 = $200
300 x $5 = $1500
80 x $25 = $2000
20 x $100 = $2000
Gives ya $5700 on a budget set of 600 chips.
200 x $1 = $200
500 x $5 = $2500
200 x $25 = $5000
100 x $100 = $10,000
Gives ya $17,700 on a bigger set, allows moving to $2/$5 in future.