When i started looking at them i though i would spend about 3k (In 1997)
Every one i looked at was just a complete bag of crap that needed 1000's spending to get it half decent.
So i ended up paying twice my original budget for the car i still have today

One of the best things i ever did.
I rag it to death, always have done, have done countless trackdays and 3 trips to the ring in it, but it gets very well maintained and loads of TLC
As Mr S1 says, you need to be able to afford to run them, and if you cant give them the time and attention, they break!