Welcome to the Forum. My choice would be a two berth but it’s best to review a number of models on paper, then go and see some for real. The PC magazine have listings of different layouts re models so you could start your search there. You don’t say if you plan to but new or pre owned. If the latter make sure you have a service history and a recent damp survey. Even very new vans can have damp. It’s unlikely that you will see or smell it unless it is severe. Buying from a dealer gives more rights under the Consumer Rights Act, and paying above £100 by credit card gives protection, as does buying on finance. But a private purchase from someone giving up perhaps for health or family reasons would be cheaper and may include all of the kit. Good luck and please ask away as your search moves ahead.