I've decided on the following format:

Tabs for indenting, spaces for alignment.

In gvim I have set tabstop=2 and in Crimson I have set View > Tab Size = 2 also.

This way I have tabs in the files but I can set the actual tab display to be anything I want.

This should provide a consistant look to the source code.  2 spaces is about right, 8 is way too much as your code quickly gets too far to the right.