You really don't need 50cent or $10 chips. They're made obsolete by the quarters and $5s.
If you don't have to have full racks I like what I refer to as "the Mile High Breakdown"...
160 quarters
240 $1s
200 $5s
80 $25s
20 $100s
700 chips total
This gives you $5,280 in the bank and allows you to cover .25/.25, .25/.50, and .50/1. You can stretch it to play 1/2, although you'd probably want some more $5s for full ring.