I just bought a DSTT and right now I only have 1 Gig of microSD. I have downloaded so many games but I couldn't fit all of them in so I think a 4 GB SDHC one will be right for me. The thing is, I'm worried about the .sav files. I put 18 trimmed games in it so all in all, it's 933 MB. There's 6 MB for the software for the DSTT to work which leaves me about 10-15% of free space. If you have a DSTT or a similar flash cart, how much space do you allocate for .sav files and how large is an average .sav file. I have 18 .NDS files in it.