I think if you're deploying .net code you're almost certainly going to follow similar build architecture with TeamCity doing most of the grunt work. We have a very similar build structure but a bit more polished I think. Our TeamCity build agents build nuget packages, deploy them to Octopus, run unit and integration tests. Octopus handles promotions of code from dev to qa, to staging and all production environments. We also write migrations for database updates using FluentMigrator which works with just about any database driver. It's a joy deploying code on an environment like this.
Agreed on the Octopus bit. TeamCity + Octopus is practically magical. Until literally yesterday, I'd yet to find something that didn't work with minimal effort between the two.
