16:10 monitors are getting hard to find, but they are a more acceptable compromise for wanting to use a lcd in a cabinet.
As for the power on functionality, it's easy to test. Just unplug it while powered on and see if it comes back on automatically when you plug it back in. If that works you just need to make a relay box to have it power on when the computer boots (power the box via the computer's power supply). As for more smart options, most tvs do have an auto-wake mode for signal, but only via the vga port.