CodeIgniter over ASP.net MVC

Hey Guys,

I've used CodeIgniter now for about 5 years, a little less lately until I see that interest has picked back up. I think that's great and i'm looking forward to seeing where CodeIgniter goes from here. My issue is, I've changed jobs recently, and I've gone from a PHP shop to a .Net shop. I have my first project coming up, and I actually have the choice of whether I want to use PHP or ASP.NET MVC (don't ask). Of course, it would be preferred to use ASP.NET MVC because the infrastructure is already in place for it. I'm torn though because I love CodeIgniter, but unfortunately we aren't set up to use it. We are very integrated with the .NET and Visual Studio with TFS for our code repository and version control. Can anyone that has faced this issue tell me why they chose one over the other and your experience. Is ASP.NET MVC a worthy alternative to CodeIgniter?

I'm not looking for a flame war, i'm just faced with this tough choice and want to choose right.

Thanks

Lee