[tomb1]

For tourneys, we have better luck using more of the middle chips and fewer of the lowest denomination. This lets you get more players for the chips you buy. You also have to account for coloring up ("racing off") the lowest chips when the blinds get higher. (For example, taking out all the $5 chips and replacing them with $25s once the blinds get to $25/$50 and a few players are knocked out.)

Here's a suggestion that works well for 8 players:

10 x $5 (total 80 chips)
14 x $25 (112)
6 x $100 (48 )
Total 30 chips each for T$1,000 starting stacks

On top of the starting stacks you need more $25s to color up the $5s, and some $100s to color up the $25s if you wish. This gives you all $100s in play when you're down to 2-3 players.

Total quantities to buy for a 300 set would be:
80 x $5
140 x $25 (allows for coloring up all $5s with a few extras)
80 x $100 (allows for coloring up all $25s in play)

With a little tweaking you can easily host a 10-man tourney with 300 chips. I have 300 Pharaoh's (with higher denoms) that easily support 10 players.