[matthiasb]

If you have a spare screen, this is a nice low cost alternative: https://www.raspberrypi.org/blog/magic-mirror/

[rmxt]

Thanks. Any suggestions for a purchasable low-cost, low-power, low-medium resolution, largish screen?

EDIT: Self-suggestion : https://www.adafruit.com/products/1287.... and the linked to tutorial has some suggestions.

[harpastum]

You can get refurbished 17" monitors from Newegg for about $50: http://www.newegg.com/Product/Product.aspx?Item=N82E16824195...

If you're using an rPi and don't want to get an adapter, the cheapest HDMI-input display is this 20" 1600x900px for $90 new: http://www.newegg.com/Product/Product.aspx?Item=N82E16824112...