If I'd to choose I'd take SharpArchitecture. But if you're new to Asp.Net MVC its pretty big and if you look at the Northwind sample, there are some Asp.Net MVC specific - maybe I'm too strict by saying it - antipatterns in it (leaking Domain Objects into view, not one-view-one-viewmodel,...)
Taking the things I've learned there and understanding the structure called "Onion Architecture" by looking here, I propose a basic project structure like I pointed out in this answer.
It's "basic", as it gives you no example project but an overview of a general well structured web app which uses Asp.net MVC, ORM, DI and some good practices for using Asp.Net MVC "right".
