what is the best thread count for a down comforter?

i have looked at overstock.com and i saw that the ones that i like are ranged from 300 to 400 thread counts. I was wondering if those are considered good thread counts or should i look for something much higher

Those are both adequate. The higher you go, the higher the cost.

Concierge Collection 600 Thread Count Hungarian White Do…

[affmage source="ebay" results="9"]down comforter thread count[/affmage]