help buying a campervan...

hi to all new to the site and the world of campervans were in the middle of looking for a campervan but with the options available is hard decide especially when you dont really know much about what your looking at. one of the vans we keep looking back at is a timberland high top which is the ducato 2.5d base on a 99 plate 69000 miles any thought on this?? i was also looking at the transit around 51 plate or any other thoughts?? where looking at spending about £10.000 but would go up to 12 for the right van we want something with enough room for 3 week away something we can stand up in something reliable and thats nice to drive any suggestions and advice would be appreciated.