Debian Web Server

Well, I turned one of my [8] computers into a file/web/FTP/SSH/etc.. server. I got a no-ip.org free DNS so far, and its working great. And of course, its running Debian, the greatest distro of all time. Instead of wasting time installing PHP, Apache, etc.. separately, I just used LAMPP (XAMPP), which isn't very secure, or so I've read. I also got another HDD mounted as /opt so all the files are mounted on their. Oh, thats right..the spec of the server:
Intel Pentium III @ 450mhz
512Mb RAM
10GB HDD as /
40GB HDD as /opt