Need some general prices for YFZ rebuild

[bad01300ex]

Ok well bought this used and started to get into racing and i think i need a rebuild. The stock(with a pipe) yfz power is plenty for me, and the track i race at, so im not really lookin for and high performance big bore stuff or anything, would the wr setup be good? ive got less than five hours on a brand new cylinder/ring/piston but im afraid my bottom end was the problem and i want to rebuild it befor it destroys everthing. I want to get sparks to do it bc they do the oiling mod, so should i just replace with stock parts? and what prices am i looking at? that is my main concern! i want it runing, correctly, with relialbility.

Thanks