Got the auto too and was thinking about buying a set of alloys. Having perved over a few parked berlingos it seems they are all have 16's in the alloys and have a narrower tyre on.
14 Plate Berlingo Multispace XTR
Personally for what its worth its steel every time.The roads that we have here in England are no better than tracks what with the speed humps,potholes and other problems,you know yourself all you have to do is touch a pavement with a alloy wheel,[ this is not a case of if but " when " ] repairs are very expensive,let alone the amount of hours cleaning all the brake dust off,ive also got a Merc SLK just for fun,i hate the damn wheels ! Steels are durable and cheap,and you can buy some very nice covers these days which are cheap enough to change every so often when they become damaged.Ive got some lovely ones on my Berlingo very similar to the steel wheeled Berlingo but a full set cost me £20 for ebay brand new and only require a quick clean with a soft brush and water occasionally.