Ask HN: Best server-side Javascript framework

I'm building a simple SaaS app and have been using Django+MongoDB for the server side bits, but my app is a very heavy JS RIA and I'd love to do the backend in JS, too. Wanted to see what HNers recommended for server-side JS. I'm a Rails guy, so am used to being spoon fed... Have a VPS with a number of PHP and Rails apps, so am comfy administering stuff. * I'm wary of Node.js because it's so young, I'm a touch worried about it crashing and it requires a new set of JS-derived drivers/libs. But it has a huge range of frameworks that run on it and huge community. * RingoJS seems like a very solid foundation and it gives access to a huge range of Java libs (of ever-varying quality). But I'm not in love with its programming model and it has a relatively small number of add-on frameworks and a small community. Any other contenders I'm missing? Better to stick with Django?