You need to get some metrics for each of your containers. Rather than choosing a cloud machine that is similar to your current computer, consider micro-instances to host each of your services. That way, you can upscale only those instances that require additional capacity.

At $100+/month, I would like to think that you are generating sufficient revenue to cover those costs plus a return on your time and effort. $100/month over a year pays for a rather nice notebook.