Had some free time tonight and got to tinker a bit. Here's my progress:
Highpoint 2640x4 RAID card:
Highpoint makes a 4-port RAID card called the "2640x4" (uses a 4x PCIe interface) and offers 4 SATA ports (they also make a 1x PCIe model called the "2640x1"). It includes cables (a single, long combo data/power cable that terminates in a data cable and Molex connector, 4 total - really nice!). Currently going for $129 on Newegg:
http://www.newegg.com/Product/Produc...82E16816115050
This card supports Hardware RAID 0/1/5/10/JBOD. Drivers are built into Snow Leopard; the card is recognized natively from 10.6.0 on up and no software installation is required to make it work (even on a Hackintosh!). It can be used as a secondary or boot drive. It is recognized by the Snow Leopard DVD. You can clone your existing install to it as well. It shows up in BIOS as a boot order device, so you can set it to be the first boot device, if you'd like. The boot order goes like this on my Gigabyte UD3P board:
1. BIOS
2. AHCI BIOS (built into the Gigabyte)
3. RAID BIOS (the Highpoint card's BIOS)
4. Verifying DMI pool...Chameleon boot selection screen...OS X
You hit CTRL + H to get into the RAID BIOS; it scans the disks after the AHCI BIOS loads and sits there for 5 or 10 seconds (spinning up the disks, I believe), which gives you plenty of time to get into the RAID BIOS if you need to.
I tested it as a SATA controller and as a RAID controller. If you don't do any configuration of the drives in the RAID BIOS, then the drives just show up as individual drives, as if it were a SATA controller. So if you just need to add more drives to your system and can't find a cheap SATA card, this can definitely do the trick. I tested a pair of drives in a stripe and it showed up just fine as a secondary set, cloned fine, and booted fine. Showed up in Disk Utility on the Snow Leopard DVD (via USB and using a DMG to restore my pre-formatted 10.6.6 disk image from another drive).
Worked like a champ all around. Zero fuss. Fwiw, I've heard that Highpoint's customer service stinks and that their hardware can be iffy. Mixed reviews on most of their hardware. Also as a note, this requires a 4x PCI Express slot, so your DS3L will not work with this, but your UD3P can. I haven't tried the 1x PCIe version, but it's probably worth a shot. Just note that on a PCI Express 1.0 bus, you are going to be limited to 250 MB/s max on a 1x connection (one-way), whereas a 4x connection will give you 1000 MB/s max.
Naked image:
Tinkered around with my pre-formatted 10.6.6 disc image I created in SuperDuper. I wanted to see if (1) I could restore it from Disk Utility, and (2) if I could restore it from the Snow Leopard DVD. The good news is "yes" to both. Not really bad news per say, but it does take 5x as long to restore (15 minutes with Disk Utility vs. 3.5 minutes with SuperDuper).
Using SuperDuper from an internal SATA hard drive to an externally-docked USB-connected SATA hard drive, it takes approximately 3.5 minutes to do a full restore. Using Disk Utility, it takes roughly 15 minutes. Still much faster than doing a full fresh install either way. The nice thing about the Disk Utility method is that you could use a Snow Leopard DVD to restore the image if you needed an emergency installation disc, or even a USB stick with the Snow Leopard DVD restored to it.
Or if you really wanted to get crazy, you could restore a Snow Leopard DVD to a USB stick and then copy the 10.6.6 preformatted DMG over, boot up the stick to the Snow Leopard installer, open Disk Utility, and restore from there. Not sure how long that would take (slow USB to fast SATA), but you could do it!