I need a very light weight GUI to run under Ubuntu 9.04 (jaunty) with a twist

I have a VPS, for which I am paying next to nothing and grandfathered in. Therefore I am unwilling to part with it. And I want it to perform a smidgen more by making it accessible via VNC. Mind you this VPS runs with 256MB RAM, burstable to 512 MB only. And it is stuck at Ubuntu version 9.04, for which the usual Ubuntu archive is not providing any more new installations as it is out of support I believe. Upgrading to a supportable Ubuntu version is harder than pulling teeth at this time. So, my question has two parts: 1. What is the best and lightest weight window manager that will run under jaunty with 256MB RAM? 2. (the twist) Where can I download all necessary parts so that I don't need to use any repositories to install it?