Why don't you use one of the BitNami stacks depending on the specs of the project? It seems to be a waste of resources to install everything on one VM (unless you really need everything all the time).
http://bitnami.org/stack/
Personally, I would create a VM with an Ubuntu (or Debian) server install, and just apt-get the necessary packages needed for the project. If you have problems installing a full LAMP stack have a look at the tutorials on HowToForge. Installing most projects - with standard configs - is really not that hard.
BTW "Subversion setup for multiple repositories" - you can create as much repositories as you want using svnadmin, the only thing you have to do is install subversion itself (apt-get install subversion), and configure your repo's once you created them.
