Martin
I bought the 320d touring from new in 2003.
There are more roomy estates, but few that are as much fun to drive (yes, its a diesel!). Very responsive and, gives over 55mpg on trips and towing, gives between 30-34mpg.
Not sure which one you will go for, but the estate is around 1580kg, so towing 1300 is well within the 85% match. For a guide to weights, try http://www.clicreports.co.uk/
Hope this helps
Ken