yes, there is not a very large selection of ram meeting their specifications on the market at this point. They are basically contracting with Unigen to expand that availability, unfortunately that is in the beginning stages, but soon the modules will be available for us. bit of a wait, unfortunately. there are plenty of modules available for the 2GB size, but it is 4GB that is the problem.

I have built a bit of a rapport with one of their support techs, and i will say this, their tech support is stellar. they are friendly and helpful, and have helped me to explore some possibilities. I have been ignored by some manufacturers once they find out about the non-server motherboard, non-supported drives, etc. That can be frustrating as they then basically blow you off.
So, Areca's willingness to help is nice. Even though the ram issue is frustrating, it takes a bit of the sting out of it.
Asked a few other questions here and there and on the subject of TRIM support i was given this response:

The TRIM command specification is being standardized as part of the AT Attachment (ATA) interface standard, led by Technical Committee T13 of the International Committee for Information Technology Standards. A TRIM command allows an operating system to tell a solid-state drive (or "SSD") which data blocks are no longer in use, such as those left by deleted files. You should use the OS build-in ATA command device driver to communicate the ATA port for TRIM command. But, most of the RAID adapters emulate the SCSI command to support more volumes on one RAID adapter. That's why the TRIM command can not support on all vendors of RAID adapters. NetAPP just proposal the Trim command for SCSI spec to T10/10-084r0 and 079r0 on 2 March 2010. It may be included the Trim function on the OS in the future. This is the only method to add the function on the firmware level.
This is enlightening as it helps to explain our long wait for TRIM in regards to Raid. The problem with hardware raid passing the command is apparently the result of needing to be included in SCSI spec.