What about using F2FS as filesystem for the system in the future ?
Performances are interesting :
http://www.phoronix.com/scan.p…tem=linux_f2fs_sdhc&num=3
It seems to be available in Debian but don't know if available in the default kernel, so maybe the is some work to do to make it able to boot on F2FS partitions :
http://git.kernel.org/cgit/lin…t/jaegeuk/f2fs-tools.git/