RAID setup question

[dsghs]

So I'm planning my next server "step-up" configuration and I want to do the recommended 1+0. I plan on using Mac Pro Servers but I'm not sure which way to go on the RAID setup.

http://store.apple.com/us/product/MB845Z/A/mac-pro-raid-card

or

http://www.promise.com/storage/raid_series.aspx?m=192&region=en-global&rsn1=40&rsn3=47

So which one should I use? Can I use the pegasus as the system disk as well and not even use the internals?

[Wim Decorte]

Thunderbolt is pretty new so I wouldn't use it for a production server (yet) until it has proven what the reliability is.