jbrooks

We too use Basecamp for our project management.

Also, I tried using Freshbooks for invoicing, but it's restrictions with multiple currencies made me to look out for an alternative solution.

Recently, I found CurdBee for invoicing which turned out really productive to me. It allows managing unlimited clients with multiple currencies seamlessly. Also, their UIs are so intuitive making the whole process very simple. If you are budget conscious like me and also want to get your work done you should try CurdBee.