Firstly, good choice of song, mate.
Did Kelly Groucutt record that, or was it Jeff Lynne?
It feels more economical with fingers for me, but I find that playing (just downstrokes) with a pick can be quite comfortable, but tiring depending on the speed. If you're happy playing it with fingers, then stick with them
Also, take a look at this if it helps [url="http://www.youtube.com/watch?v=PQvw2XaNj9E"]http://www.youtube.com/watch?v=PQvw2XaNj9E[/url]