Go with the rio 800 later in the year a company named dataplay is going to put their 500 mb discs in a backpack for a rio 600 or 800. The discs only cost about 10 dollars so I imagine that it won't be that much but you never know with S3. BTW The rio 800 is now available with 128 mb on board memory. I'm going to sell my nomad II once the dataplay discs come out in backpacks