Motorola 3.5" video monitor. It's one of the priciest models at $239+ , but it's been great for us.
I think a video monitor is a must if you have multiple stories or a large residence and really useful at night to give you peace of mind and let you see what your kids are doing. You pretty much need that 3.5 inch screen size to get good resolution, so smaller models are less ideal. Night vision is very good and sound is clear. It's expandable with additional cameras if you need to monitor several rooms. It has panning and tilt controls to move the camera. Controls are basic, but simple and the unit seems durable. I've dropped the monitor a few times (and it will happen) with no apparent damage.