Yeah, I've tried EC2, but I had a bad experience with their free tier(they started charging me for an elatic IP even when my instance was off) and their customer support was awful. If we ever need to scale, I think we will host on rackspace. However, currently nodester is an awesome free host. I highly recommend them.
One big problem is that drawing anything details is hard without a tablet.
I'm also using Node.JS on Quip. Configuring it on EC2 wasn't that difficult if you've considered it.