As far as the RAID thing:
Using an Intel or AMD native controller, if your controller is in RAID mode, AHCI is automatically supported in RAID mode. Both the current Intel and AMD controllers support TRIM in RAID mode (with a single SSD, not sure about an actual RAID of SSD's). All you have to do is install the drivers and they'll take care of the single SSD for TRIM.
This is nice if you have a RAID array of mechanical drives, and would still like the full benefits of your SSD, without having to resort to the dreadful Marvell controller.
The Marvell controllers, I repeat, the Marvell controllers DO NOT support TRIM even in AHCI mode. They're also nowhere NEAR the rated 6Gb/s either. And once the drivers are installed for the Marvell controllers, you'll get stuttering.
You hate that Marvell controller don't you