TL-IGHTS

My car has 92 thousand miles on it and has already been thru one tranny. I am wondering if I should sell it and buy something else, or should I keep dropping money into it because as long as I have the car, I am going to want to put money into it. What are the options as far as an extended warranty? I also need a new cat, which, from what I hear, is around 700 to replace with labor. Ah! I am frustrated and I don't know what to do, I love the car, but I am scared that with the high mileage that it wouldnt be worth keeping and moding.
Thanks for any input,
Matt