Here is a LCD screen I've been thinking of that has a 20x4 screen, keypad, buzzer, sensor I/O ports, real time clock + holder for battery, and ability to mount an EEPROM for larger data collection: http://www.ebay.com/itm/221120816817?ssPageName=STRK:MESINDXX:IT&_trksid=p3984.m1436.l2649
You may recognize that this shield was designed by one of our regular forum members and that any required support should be readily available.
Don