It might be too late for this specific request, but I regularly go to Goma for my work (I'm based in Lubumbashi) and have quite up-to-date information about security in the area.
In general Goma itself is quite ok in terms of security, and the border crossing coming from Rwanda is not very difficult (at least to Congolese standards). Going north of Goma however is something that needs to be thoroughly checked before venturing in that area - security is very volatile and can change from day to day.
Best sources are NGO's (or sometimes UN - but they tend to be, well, UN...), of which you can find enough in Goma (if you go to IRC - International Rescue Committee- you can always use my name as intro).
For info about Congo-DRC in general, don't hesitate to contact me anyway...