[compudaze]

I would make it an even T3000 go with 8/8/4 breakdown per player and and still buy 100/100/50/50 chips for your 300. You'll have enough 100s to colorup the 25s. You can use the extra 500s/1000s to colorup the 100s and/or for rebuys.

I would use blinds something like this:
25-25
25-50
50-100
75-150
100-200
150-300
200-400
300-600
400-800
600-1200 \__May end around here for 10 players, no rebuys
800-1600 /
1000-2000
1500-3000
2000-4000
3000-6000

30m levels should give you about a 5h - 5h30m game. 20 levels estimated 3h20m - 3h40m game.

You can get rid of the 75-150 and/or the 150-300 levels to move things along more quickly if you would like.