JR2408 & Kenyada,
I don't think that will work. The reason is that while you can setup the disks as a RAID in the bios and then use the Ctrl "I" command to select the proper drives for the install, you still need to have something format the pair before you can do the install and you need the RAID drivers to even be able to see and talk to the RAID set. I don't know anything about Acronis TrueImage software so possibly it can load the drivers and format the RAID set. Check the software to see if this is possible. Windows does require the complete wiping of any designated disks for a RAID array (0 or 1) and reformatting. You have to load RAID drivers using F6 on the Windows re-install.
If one wants the RAID pair to be a data set (e.g., a separate disk set for data), then one also needs to load the Intel Matrix Storage Manager from within Windows as well, once the OpSys is loaded. See details at:
http://www.intel.com/support/chipsets/imsm/sb/CS-022648.htm#4
You will want to have the Intel Matrix Storage Manager loaded no matter what since it has important RAID monitoring functions that can detect potential problems including pending disk failure, data integrity errors (due to a system crash, etc.) and will automatically repair them. If no other reason than this you probably want to reload everything from scratch just to make sure this is working properly.
Don't use the drivers on the supplied ASUS CD since they are all old. Get the latest ones from the Intel website. Use the link above.
As mentioned in other posts use the Intel south bridge (ICH7R) connectors. They are the fastest. The EZ_RAID connectors are also attached to the south bridge but BOTH connectors SHARE one port, e.g., the missing SATA2 connector. The directly connected ports are labeled SATA1, SATA3, and SATA4.
There is a lot of good info on all of this on the ASUS website. Look at all threads with "RAID" in the title. Pain to use because of the slowness of the ASUS forums, but the info is very good. Start with the following link to pass some of the setup hassle.
http://vip.asus.com/forum/topic.aspx?board_id=1&model=P5W%20DH%20Deluxe&SLanguage=en-us
Paul