Ben,
AC is going to see the most significant performance boost from using the SSD [in RAID] to run the Amazing Charts directory on them, which would include the database files and Imported Items sub-directory.
I would install the directory on a separate drive [mount point], but keep in mind that AC will assume the C: drive, and some Microsoft installs INSIST on the C: drive.
Unless you are running on a full MS SQL install, memory has limited utility on the server beyond general head-room and running other services.
