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300 inserts per minute, 6 million rows per month

I have a Django application using Postgresql 9.3 that is about to grow in load to about 300 inserts per minute (peak load) and about 6 million rows per month in one table. Also there should be a lot of queries on that same table, nothing complicated, just a sum grouping by and indexed field.

Can anyone tell me how much hardware should I provide for this load or what would be a good way to handle this?

Thanks a lot.