[photon137]

Using a cluster of Owin (self-hosted) servers with NancyFx on Mono to host REST APIs behind nginx for a distributed-computing solution on AWS. Also use EntityFramework on Npgsql+postgres - experience has been positive.

Only downside is that for something like a customer-facing portal, the identity-management is tied to Windows-specific features, for now - so have had to build a custom solution for this that runs on Linux. Waiting for ASP .NET vNext and its Identity solution when it becomes slightly more mature.

EDIT: Also evaluating a move to Azure. Primary driver (for choosing the .net stack) has been prior experience with C#, .NET and Visual Studio