Hi Phill,
If your vehicle is suited to towing the extra weight go for the Elddis. I have a 2006 Superstorm and believe me it's one hell of a caravan. The Elddis build quality is fantastic, just look at this month's C.C. magazine review of the compass Rallye (same van different colour schemes)to confirm this. The Bailey Ranger is a nice van but just does not compare with a Superstorm on build quality, eqipment or layout.
When I bought my van I wanted 6 berths with end bedrooms, several vans supplied this layout but none could compete with the Superstorm. If you look at a lot of postings you will note that it is very high on a lot of peoples wish list as the van they aspire to owning. Go for it , you know it makes sense.
P.S. Drive a hard deal and you should get a healthy discount, I did with Mendip caravans.
regards
Steve