Hello there,
First of all, the price and time are just placeholders since I still don't know what's the job about and how big is it.
Now... I'm someone with quite fuew years of experience working with databases, building, planning and optimizing schemas and queries for relational databases.
Most of the time I've been working with MySQL, I don't touch PostgreSQL in some time, but, I think that as long as the bases are strong, the RDBMS is not a big deal.
Anyways, contact me if you want to talk a bit deeper about this!.
Cheers ~