ordering nexgens tonight... are 500 needed? or do 400 get the job done

[snapfc01]

hey... i am getting new chips and have decided to get the nexgens however i'm trying to figure out if i need 500 or just 400. i mostly play nl tournaments (ten people max but most of the time only 7 or 8). i plan on getting 4 colors (25chip, 100 chip, 500 chip, 1000chip) and i start the tournaments with 3k a person (20-25 chips, 10-100 chips and 3-500 chips, use the 1000 chips for when we are down to 2 or 3 people) with these numbers i don't see a reason to get more then 200-25 chips... 125-100 chips.. 50-500 chips and 25-1k chips... any thoughts? if i were to get 500 what would u do differently?

thanks in advice for your thoughts
Gerard