Well, cheap is a relative word since if you need a LCD display in your case you’ll spend around 200€, but here are some options:
Silverstone LC10M
Silverstone LC03V
Silverstone LC16M
Antec Fusion
Thermaltake Mozart
Thermaletake Mozart SX
Thermaltake bach
More expensive are the Zalman
Zalman HD135
Zalman HD160
Anyhow an external display which is HD44780 compatible should be fine.