no car is even close to perfect – thats how manufactureres sell new cars.
anything at 3-4k is going to need money spent on it to keep it on the road UNLESS its slow – NA/not tuned to death.
NA Diesel engine will be your best bet for bomb proof imo and as few electrics as possible. – wont do mega MPG – 40MPG to be expected.
Not so fussy on service as a turbo , no DMF (as N/A engined vehicles generally are pre DMF)
slow as shit though. but can take a load and petrol engines dont get on , hate the constant gear changing to get up hills. The N/A in my van performed the same with an 900KG engine and gear box in the back as it did with nothing – only difference was the illumination of the top of the trees due to the rear end being slammed – would have been a grim experiance with a small petrol engine.