I can recommend you use the Foglyn connector with the FogBugz server. The FogBugz server is free for 1 or 2 users , and you can also get a free Foglyn license for this edition of FogBugz. In addition, with free FogBugz you also get Kiln, which is a Mercurial-based version control and code checking system, although you probably will not use part of the code review. You can use the free FogBugz + Kiln for any number of projects, open source or not, the only condition is the number of users (max. 2). The big advantage is that you do not need to run your own FogBugz server, but you can use a hosting solution. This simplifies setup.
( : Foglyn)