I have 32 GB of memory in my PC. This is more than enough for a linux OS. Is there an easy to use version of Linux (Ubuntu preferably) that can be booted via optical or USB disk and be run completely within RAM? I know a live disc can be booted with a hard disk, but stuff still runs off the disc and this takes a while to load. I'd like everything loaded into RAM and then run from there, completely volatile. Any files I need to create would be saved to a USB disk.
I'm aware of http://en.wikipedia.org/wiki/List_of_Linux_distributions_that_run_from_RAM but these all depend on a little bit of RAM. I'd prefer something like Ubuntu instead of these light versions.