In 2005 we purchased a REVCO (Thermo Fisher Scientific, Inc) Ultima II Model UFP430A18 under the counter component freezer and like it very much. We store roughly the same quantity of plasma and cryo that your facility does and the freezer is only 5 cu ft. It has a digital display readout to the tenth degree Celcius, range from -10C to -40C with preset temp setpoints of -20C and -30C. It also auto defrosts, alarm is easy to test, has remote alarm capibility, and keyed door locks. Visit www.thermo.com and search for REVCO Ultima II freezers.