Model B is the big brother of Model A+ that is much more cheaper for specific implementation in an embedded project where the most minimal use of electrical power is needed.
The RPI2 can be hooked up to a decent monitor or projector using VGA connectors. All that is needed is a HDMI to VGA adapter. This adapter may comes with additional functions like audio output, additional power source or USB. Price differences are huge but here is an example that I got from online and it works just fine with the NEC AccuSync LCD52v monitor.
|HDMI to VGA cable plugged to RPI2 and female VGA.|