For those interested in the technical specs: we're using Django, PostgreSQL, Bootstrap (we are not designers), nginx, uwsgi. We are going to use Stripe for billing (when I get it implemented).
We currently have two 512 MB nodes with Linode.
We're using this cool bootstrap-styled datepicker: https://github.com/eternicode/bootstrap-datepicker
We've focused more on functionality and less on design.
Early users like having visibility to their holdings. Let us know what you think.