How did you get on with this? I was going to post something similar but did a search and found your comment first.
I am using Ubuntu on my laptop, its not the fastest laptop but I want to slim it down, why a need for Kate AND Kwrite? And Speech synthesis? No need for that at all.
At the moment I've got a lot of packages asking to be removed using apt-get autoremove which I'm a bit cautious of doing as I think it will scrub a lot of things off.
Here is what mine is saying atm...
For example I get this when I try to remove KSirc
Reading state information... Done
The following packages were automatically installed and are no longer required:
knetwalk kpat kpdf kdepim ksokoban kscreensaver-xsavers libconvert-binhex-perl krdc krec korn krfb kscd kppp libattr1-dev kshisen kmahjongg klaptopdaemon ksig kdelibs4-dev ksim kwifimanager
kcharselect kjumpingcube kdeartwork-style kregexpeditor knewsticker-scripts kdeartwork-misc kcoloredit kdessh ktip kdeprint libaspell-dev libpth20 libtunepimp-bin knode kmrml katomic
kdemultimedia-dev kleopatra kdegames-card-data ksvg kscreensaver kruler ktux libaudiofile-dev kgoldrunner kbackgammon kpoker libavahi-compat-libdnssd1 dirmngr kdepim-kfile-plugins libglib2.0-dev
libkiten1 ksnapshot kenolaba kblackbox kdebase comerr-dev fftw3 atlantikdesigner konsolekalendar libpcre3-dev kfloppy kdegraphics-kfile-plugins ksame konqueror-nsplugins kpager liblualib50-dev
kde-core kcalc klipper kandy kdemultimedia-kappfinder-data kontact kdeartwork-theme-icon ksmserver ksysguard librss1 klickety libkrb5-dev kpovmodeler libsasl2-dev libavahi-client-dev
libjasper-1.701-dev libogg-dev kalarm noatun-plugins kworldclock mpeglib kdewebdev kmenuedit kdegames kicker-applets kdict libpcrecpp0 ktnef khexedit kedit kbounce korganizer
kdenetwork-kfile-plugins kimagemapeditor atlantik akregator liblua50-dev libgammu0 lua50 libjasper-runtime libavahi-qt3-dev kview libdb4.3++c2 ktron libacl1-dev ksync libtiff-tools
kdeartwork-emoticons dcoprss hspell kwin4 kdewallpapers libio-stringy-perl libxslt1-dev libdbus-1-dev libssl-dev kdeaddons kreversi kdf libksba8 kspaceduel gnupg-agent kpf juk noatun kdnssd
klines kdemultimedia-kfile-plugins fifteenapplet kdemultimedia kfaxview edict lskat knotes kaddressbook-plugins libarts1-mpeglib kgamma libtunepimp5 libxml2-dev libtiff4-dev libart-2.0-dev
libesd0-dev networkstatus kdeutils khelpcenter kdegraphics kaboodle libkpimexchange1 kmailcvt libindex0 libmime-perl kanjidic libasound2-dev kdeartwork-theme-window ksysguardd libtiffxx0c2
ksmiletris konq-plugins kpersonalizer libkadm55 libarts1-audiofile kbattleship kiconedit kpilot kasteroids kfouleggs libmal1 libkgantt0 kwalletmanager knewsticker kopete ksnake kdelibs kappfinder
eyesapplet libopenexr-dev libartsc0-dev karm kate kdelirc superkaramba kjots kfax libavahi-common-dev ksirtet kmines kget pinentry-qt kgpg libvorbis-dev konquest kate-plugins
libboost-python1.33.1 kolourpaint gpgsm gnupg2 kitchensync kdeaddons-kfile-plugins gettext-kde libarts1-xine libidn11-dev kdepim-kresources libofa0 kdepim-wizards kmilo libbz2-dev ktuberling
ktimer kmid kteatime libarts1-dev kdepasswd libnews-nntpclient-perl kmix kdeartwork kodo
Use 'apt-get autoremove' to remove them.
The following packages will be REMOVED
kdenetwork ksirc
0 upgraded, 0 newly installed, 2 to remove and 0 not upgraded.
Need to get 0B of archives.
After unpacking 2568kB disk space will be freed.
Do you want to continue [Y/n]?