Here is a small little app that I love to edit with, other than nano and gedit, it uses much less ram and opens instantaneously.
Install it Easily by doing:
apt-get install mousepad
or click on Applications->Add/Remove..-> then search for mousepad and check it to download & install.
Here is a little tip from my tutorial Less typing in the command line
root@ion:~# alias pad="mousepad"
^opens mousepad and you can just type "pad /etc/sysctl.conf" without the quotes of course :)