You really want to be going for the newest possible V40 with the best possible spec.
At a minimum you should get one with the 7 inch display with satnav, the full TFT screen and heated seats. The 5.5" base screen is ridiculously small and its very obvious that a bigger screen is supposed to be there.
The lower spec V40s just don't seem worth the money... avoid anything in "ES" spec as you get this hideous speedometer in place of the TFT display.