HDD RAID Upgrade for old Dell?

So i've got this old Dell XPS R450 (http://docs.us.dell.com/docs/systems/dkhan/Specs.htm) which is still my primary computer and I was planning on installing a RAID. My question is, is it worth shelling out the extra cash for S-ATA drives/controller on my old system or would Ultra ATA 133 pretty much give me the same performance for less money? I guess i should also mention i did upgrade my CPU awhile back from the original PII 450 to a PIII 850, and my memory is maxed out at 384MB, and i've since added a DVD/CD burner, if that makes a difference.

Thanks,

-g

I had one of your boards with a 256MB, 16-chip double sided DIMM in slot 1 and two 128MB 8-chip single-sided DIMMs in the other two slots, it was working fine with 512MB of RAM.

SATA doesn't offer any advantage with today's drives, and the PCI slot is limitted to 133MB/s (like ATA 133) anyway.

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