I actually have this debate with myself every time I think that I am close to the point of deploying my work (heh, that's another story). But every time I do the calculation, I just don't get how AWS would be more beneficial to me vs sticking with Linode. AWS' pricing would be much more than Linode's model. So for a while, I think I am set on this resolve:

Using Linode for my app and host static files on S3 and maybe another cloud provider like Rackspace for failover in case the clouds go down.

I am hoping that I would have a luxury problem once my app is doing well. When I have that kind of traction, it's a different story. But until then, it's more logical to stick with a VPS.

By the way, are you making updates to your production site frequently? Your carousel isn't working correctly yet.

I know you use django (from another post I think). Have you thought about using social network login? I used django-allauth and it has been working very well for me. Good luck!