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I'm not sure there is actually something in the open source space that is ACID compliant and offers all those features.

Sharding is a problem in Postgres and I am sure they will fix the disconnect between how the data is inserted and how it's read pretty soon.

Automatic failover and datacentre awareness are not typical features in Open Source RDBMS, although you some NOSQL solutions may do this for you.

I'm willing to overlook many weaknesses in PG as we get blistering performance and amazing stability combined with features like hot schema upgrades.

Good luck finding a simple package. We met failover and cross-site replication requirements by using Pacemaker controlling pgsql.

AFAIK the only solution to this in the MySQL world is MHA. And that seems not that much better than the way Postgres does it. Which Relational databases are you referring to that do have this?