du -cks *|sort -rn|head -11|awk '{printf "%-8.2f MiB\t%s\n", $1/1024, $2}'
NB: first item is the total size, so it outputs eleven lines.
Update: a better version is this one:
du -cks *|sort -rn|head -11|awk '{printf "%-8.2f MiB\t", $1/1024;\
for(i=2; i<=NF; i++) {printf " %s", $i}; printf "\n"}'
... as it takes into account file names with spaces in them. You may also want to squeeze in a BEGIN { FS = " " } at the beginning, so as to prevent tabs from being considered as field separators.