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Wolverine:I guess the best answer is to get a tray which can support the most attachments and accessories. Also, its not a bad idea to get one which can support more housings. UCLS is one which has loads of features but it can't support an Ike housing (Sigh). However, the arms are excellent and go with most trays. I was using a Fisheye tray before which was light and supported UCLS arms. It can be used with small digicam housings with a tripod base. Not a bad alternative to the UCLS.
http://www.uwdigitalcamera.com/En/prod_08tar_grp.php?pathID=2_8_gid&tarGID=667965544152