[Halcyon]

I personally think you are going to find it hard getting a decent van for that price and if you do get a cheap one you are bound to run into problems later on as it will be old. This will add tonnes of money in repairs.
Ideally a second hand kangoo would be good as Orange mentioned, from a garage that has it fully serviced and where it is in perfect road condition. Or go for a car instead. Spending a bit more will ensure you dont have any problems later on.