External firewire 800 disk: Raid or non Raid?

Hi all,
I am currently about to by a new external firwire 800 hard disk to replace my firewire 400 200GB Maxtor. I mainly use this disk for timemachine backups and all my final cut express scratch area and work area. I am working with AVCHD video and looking to expand the storage and speed of this disk. I have narrowed my options down to two. They are both high quality options. I will be buying the enclosure and hard disks seperatly to ensure I get a good enclosure and good quality hard disk drive.
Enclosure options:
1. http://www.macpower.com.tw/products/hdd3/pleiades/pd_scombo.
Pleiades Super S-Combo, FireWire 400/800, USB 2.0, and eSATA interfaces. This enclosure uses Oxford 934DSb or Oxford 924DSb chipset. This is a single drive enclosure and non Raid. I would put a 1TB disk in this enclosure.
2. http://www.macpower.com.tw/products/hddmulti/taurus/pdd_raid2
Taurus Raid II enclosure. FireWire 400/800, USB 2.0 and USB 1.0 interfaces. This enclosure uses Oxford 934DSb or Oxford 924DSb chipset. This is a dual drive enclosure and Raid 0 and 1. I would put a two 500GB disks in this enclosure. But will use with mirroring such that a copy of data will reside on each disk. Whilst this will reduce the overal capacity to 500GB I will have the extra redundancy should a drive fail. From which I can just replace the failed drive.
I am aware that using Raid mirroring will slow down the data transfer to the disk enclosure but I think this should be ok for AVCHD editing for my purposes. Cost wise there is not much difference between the two options. In both options I will go for either Seagate Baracuda drive or Samsung Spinpoint.
Would like to know what your thoughts are?
Which options would you go for?
Message was edited by: Just-Karma

Hi all,
Ok so I decided to not go done the raid mirriring route. Instead I finally made a decision and boughts a Macpower FW800 enclousre which uses the Oxford 934 chipset and a Samsung HD103UJ 1TB Serial ATA 3.0 Gbps
buffer memory32 MB hard disk.
The enclosure is excellent quality and the disk access is very quick via FW800. The disk itself is very quiet and also great for Final Cut with my HD editing. Only noise the disk makes is upon power up other than that it is very quiet.
I have partitioned th disk into two 500GB's. One partition is used for time machine backups and the other is the Final Cut scratch space.
I plan to buy another enclosure and 1TB disk and parition into two 500GB's also. I plan to use one of the 500GB's for Super Duper clone of iMac system hard disk and the second for cloning/backing up the scratch Final Cut space. This second disk and enclosure will be my offline backup system and will not be powered all the time.
Details of the elcousre and hard disk are provided below. I purchased them in the UK. Enclosure was purchased from www.span.com and hard disk from www.ebuyer.com. Whilst span can sell disks in the enclosure you can save yourself a little money and buy seperatly from ebuyer and install yourself.
Enclosure:
http://www.macpower.com.tw/products/hdd3/pleiades/pd_scombo
Hard disk:
http://www.samsung.com/global/business/hdd/productmodel.do?group=72&type=61&subt ype=63&model_cd=249&tab=fea

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