Recommendations for partitioning?

Don't use more than about 50 paritions ( http://www.postgresql.org/message-id/17147.1271696670@sss.pgh.pa.us )

Use triggers to make the interface easier ( https://wiki.postgresql.org/wiki/Table_partitioning#Trigger-based and http://stackoverflow.com/questions/16049396/postgres-partition-by-week )

The only data I found fell inline with what you'd expect (i.e. speeds up selects but slows down inserts/updates http://www.if-not-true-then-false.com/2009/performance-testing-between-partitioned-and-non-partitioned-postgresql-tables-part-3/ )

So I was thinking that partitioning based on month to keep the number of partitions low, so that would mean about 0.5G records in each table. Does that seem like a reasonable number of records in each partition? Is there anything else that I should consider or be aware of?

Thanks,

Dave