So your gf drives your quite valuable jeep and you are scrounging for money to make payments on a Sammy? Why not sell the jeep and get two cheaper cars?
I will say this re: driving a car you don't like. I had eight vehicles and am down to six. We are talking really nice cars and trucks. You know what I drive 90% of the time? A VW jetta sportwagen TDI. I don't love it, I don't even really like it, I bought it on a whim a few years ago. I mean it is not a bad car per se. But, it is cheap transportation, I don't have to worry about it when I park it somewhere, or it breaking down, or paying through the nose for insurance.
My advice is get something cheap and reliable and save fun cars for when you have spare cash.