Dumping Aqua on OSX for X11?

sagefire.org writes: "Aqua is a beautiful interface but it can be incredibly resource intensive (especially for older/low-end machines). And, though the opensource community has made great strides in reverse engineering proprietary drivers from OSX, I would love to be able to simply keep using the drivers that came with OSX for now.

Since there is a fully functional BSD variant under the hood, is it possible (using X11.app, darwinports, and/or fink) to boot to a command line and simply startx? Would it use less RAM to bypass Aqua?"