Install Centos 5.5 using Software RAID

Yesterday i've done my project installing Centos with Software RAID. I choose RAID 1 to make things easier for newbie. I didn't install LVM because i think the hardisk capacity is enough for the next 2 years, but i'm planning to install LVM on the fly.. can it?
Here's some reference:

1. http://en.wikipedia.org/wiki/RAID 
2. http://dennytobing.wordpress.com/2010/09/18/cara-menginstall-centos-lengkap-dengan-raid-1-dan-lvm/ (good tutorial in indonesian)
3. http://www.centos.org/docs/5/html/Deployment_Guide-en-US/s1-raid-config.html
4. http://www.linuxtopia.org/online_books/centos5/centos5_administration_guide/centos5_s1-raid-levels.html
5. http://mymcp.blogspot.com/2009/07/creating-raid-5-array-in-software-on.html
6. http://wiki.centos.org/HowTos/SoftwareRAIDonCentOS5 (i combine this tutorial with #2)
7. http://sulistyawan.wordpress.com/2009/06/19/raid-1-vs-raid-5-which-one-better/ (quite detail comparation of RAID level)
8. http://yonaldi.wordpress.com/2009/08/28/how-to-change-the-timezone-in-linux/ (setting timezone using UTC is not that instant in my case)
9. http://wiki.centos.org/TipsAndTricks/NTFS (Centos 5.5 can't read NTFS?)
10. http://forums.spry.com/centos-fedora-redhat/98-change-ssh-port.html (Changing sshd port to gain NAT access from used line)
11. http://forums.spry.com/centos-fedora-redhat/98-change-ssh-port.html (iptables tutorial)
12. http://www.linuxhomenetworking.com/wiki/index.php/Quick_HOWTO_:_Ch14_:_Linux_Firewalls_Using_iptables
13. http://techgurulive.com/2009/02/23/how-to-configure-ports-and-protocols-in-iptables/