Looking at tents for car camping I've come to the conclusion that the Vangos indeed look to be good value.
But if the car's taking the strain, why not get one you can stand up in? Still available at Sensible amounts of money from various folk, Vango included, and it has to make a useful comfort difference... Though the price tag on, say, a Vango Albany isn't huge it is quite a bit more than a Beta, but I think in real terms the ability to stand up and walk around is something well worth spending the extra on.
Pete.