Sell the family silver David and buy this baby Hymer below:
Everything you need, including a garage for the SIB.
Not cheap but they hold their value well.
Only thing I really don't like about (non-sliding-door van) conversions is the sometimes claustrophobic feel inside as the big side door on VW Transporter conversions with traditional side kitchen layout gives a great feel of bringing the outside in. Think as well if you really want a shower - pretty useless and a PITA in many compact campers.
When you live in a VW sized camper for 6 months non-stop with your wife to be you really discover what is essential and what is not. And apart from a bed, cooker, hob, fridge, table and storage not much else really is. Keep it simple, compact and easy to take into small towns* etc.
Regardless, if you're thinking of spending it is *essential* to visit all the dealers and shows and get a feel for all the different types/sizes/layouts and then to hire one for at least a weekend to try it out 'in the field'.