hi, basically im looking for a new car so i can take the mk2 off the road and re build it

i do 300+ mile round trips to uni and back every couple of weeks and apart from that its all round town stuff
i was just looking for abit of advise as to what engine spec to look at for cheapest all round running costs, i was looking at a Gt tdi 115 before but with the price of fuel and the journeys i do im not sure it would be the right way to go?
cheers