Budget motorway cruiser under £3k

[Tom-je44s]

Hi,

My journey each week is around 1200 miles p/m, all motorways. I'm after a comfy, reliable motorway cruiser that's good on fuel.
I'e considered Audi A3 TDI or BMW e90 320D, but worried that my budget of £3k is going to get a high miler with problems.

Any advice on what you would get for this low budget in mind? I'd love an Alfa GT or 159ti, but again examples at under £3k will more than likely have problems down the line.