Questions about streaming disk, firewire and SATA raids.

I have two internal drives, one for applications/system and one for audio, which had been suitable up until recently. I recently added Ivory, and some addons to the BFD drums. The BFD Deluxe has significantlly more velocity layers, and is placing a strain on computer and drives.
I moved the BFD drum data onto an external firewire 800 (because of data size) The BFD drums seem to be having a hard time keeping up, (it glitches and stutters).
I have 3 gig of ram, so I guess I'll add more ram. But I'm unsure about SATA raids. Is it better to add an external firewire RAID?... Mac Guru, has some reasonably priced kits. Has anyone had experience with them?
There is a 3 drive bay which you can put inside your G5, but I have concerns it will draw too much power and generate too much heat.
Lastly, if I buy a 4 bay external raid, can i create a 3 drive raid, and keep 1 one drive as a seperate drive (do I have to stripe all drives in one enclosure, or can they be seperate?
Any insights would be helpful.. thanx

depending on whether you use eSATA or FW, you have differnet options as to how you mount the drives as volume(s) to your computer. FW pretty much limits you to a single logical volume, although it could be RAID-0 or in some rare instances, RAID-5 with certain enclosures.
eSATA, again, depending on the specific enclosure, can mount all the drives as a single volume, but you may have the option to mount multiple logical volumes... like the 1 RAID-0 and 1 independent volume like you mentioned.
earlier tonight i recommended this drive to someone else for a laptop application...
http://www.lacie.com/products/product.htm?pid=10724
for a desktop application, you would probably go with their 3.5" solutions since buss power is not important to you.
this might not be accurate, but this is my understanding of highest read/write performance to lowest in terms of general specs (certain products may have advantages / dissadvantages depending on the implementation) all RAID-0 volumes are assumed to be 2 drive RAID, although it is technically possible to do more with certain hardware.
1) RAID-0 eSATA
2) RAID-0 FW
3) RAID-5 eSATA
4) single eSATA
5) single FW
6) RAID-0 USB2
7) RAID-5 FW
8) single USB2
9) RAID-5 USB2
RAID-5 is a real wild card here because a 3 drive image is really not the intended configuration for RAID-5... more drives is preferred before you start reaching theoretical efficiency and the actual XOR engine or lack of one can drastically affect your performance levels.

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