Talked with the main GPS guy at REI Seattle store today. New 60Cx and 60CSx units will be available in February/March timeframe. Garmin website indicates January '06 availability, but looks like they're slipping a little. One can pre-order either unit through Amazon.com, but cost savings is currently only $30 or so.
Units come with 64-MB SD card, but will support any SD card up to 1-GB as SD card technology is transparent to devices.
--Zenwolf