It's recommended that if your buying a nice set don't put monetary values on them. If you play large tourneys and have to chip up the values will not be right sometimes with large groups you need to double up the lesser value with multiple colours. Never mind when playing $5 cash games vs $50 tourneys.

Just get the standards to start and use the values most have for cash or tourneys with a chart


white -1
red -5
blue -10
green -25
black -100

and then some orange, purple and other colours can be added as you see fit.

Go to home poker tourney and look at the PDF chaarts you can download.