FORD = Fix Or Repair Daily.
But to be honest the latest generation\engines (TDCi, etc) are very impressive. However, after what would be modest mileage to any German car, most Fords, don't really last much longer.
With respect to 79k miles on an Audi - as long as the paperwork is in order and it drives well and passes any inspection - wouldn't bother me at all.
I have an Audi Tdi, that gets some right abuse - and at 205K it drives impressively well. The thing you need to bear in mind is that all the VAG group now use a convoluted multi-link front suspension, which improves driveability - however these parts are now deemed almost consumables.
I don't think you would find a car that could do 40k without wanting the bushes, etc on the front suspension changing. It's not a case of them going after high'ish mileage - design changes have made them virtually service parts.
Volvo - can't really fault them. Ultimately it's whatever you are comfortable or familiar with.
I'd always take an Audi - but that's because a few of my friends are Audi specialists and I have access to all the specialist kit - so it's cost effective for me to stick with VAG cars, and I prefer the Audis.
On a side note - if any site member needs any of the dash lights (ABS, Airbag, etc) putting out on a VAG car or similar and you're local - I'd be happy to oblige - Gratis! Takes mins with the laptop.
Dibs