go for an overbored kit without doing the bottom end. In the end you'll understand why. DON'T
take any decision before take it apart and find out what you really
start dreaming with big horse power without knowing how much money or effort you want to spend DO
choose wisely every component you put on that engine.DO
the best you can with the money you've got.DO
start with the basic i.e. ball bearings, oil seals, gaskets, chain guides, for instanceDO
take a look at my thread there's some useful info in there.
For example you mention 235$ for an overbored kit.
I got that Namura piston (Stock 74mm) for some 60$.
Consider the difference in horsepower/torque you can expect...
Need to say more?