Spatial data warehousing in PostgreSQL

In the very near future I will need to create a data warehouse for storing a rather large amount of data. I'm not sure what it will be in terabytes, but let's just say that it won't be huge instantly, but it will be big instantly, and need to scale to support whatever new data sets (dimensions) get thrown its way.

The language will be Python (Django), but I'm waffling on the database. All of my experience is with MySQL, but I believe the out-of-the-box support for some of the software we'll be using is PostgreSQL.

Do any of you have experience with data warehousing? What about a data warehouse with spatial features? And what of the trade-offs between MySQL and PostgreSQL for this task?

Any information/links you can provide on any of these subjects would be fantastic.