Which 'van for tall people?

Hi, we're currently looking for a new 'van as our '91 Abbey 516 GTS has gone to the dismantlers, due to needing and uneconomical amount of repairs to keep it useable (damp damage around door, scored brake drums, worn hitch shaft bushes, 'iffy' power control microprocessor etc) and were wondering which make/model to go for. I am 6ft 5in tall, wifey is 6ft, son (aged 12) was 5ft 7.5in when last measured and daughter (aged 9) is also very tall for her age. Our budget is around £3500-£4500 which obviously precludes many newer vans which seem to have more headroom. Does anyone have any recommendations for a 4 or 5 berth in that price range which I will not have to stoop in all of the time? :-)