You sold me with this simple site. I can handle $31 a month easy. I'll set up a monthly investment into index funds later today. I have a Sharebuilder account,

You sold me with this simple site. I can handle $31 a month easy. I'll set up a monthly investment into index funds later today. I have a Sharebuilder account, but would there be a better site to do this from nowadays? Preferably with a good companion app?