First of all, if your asking how much an el camino is going cost to run as a a daily, you cant afford one. There collectors cars, old, and RWD. Meaning its going to cost a lot to buy, be very hard and expensive to find parts for, and handle like shit. Even with snow tires or weight in the bed the back end is still going to slip out under power in the snow because its still RWD. Tires/weight will just help with the problem, not fix it.
Second, that blue car is a WRX wagon with the back shooped off.
Third, you should look into a subaru brat, its like the baja, but with that classic 'el camino' look. Obviously AWD and totally rad. You will get more attention in a brat from subby enthusiasts than in an STi. Theyre hard as hell to find, but there so damn awesome.