I need to buy a safe, something I've only used in hotels before. Anybody recommend one?

Need probably 20×20×12cm or larger, passport and other small items. Will be fixed somewhere discreet and solid. Under floor would be less preferable. Would prefer keypad as the primary opening method. House is reasonably secure already, nothing over and above fairly modern windows and doors except for the addition of secure euro locks (avocet ABS).

Thanks in advance.