Davie,
The idea i had of NOS was based on the fact that you were looking to do it as cheaply as possible and maybe didnt have the cash jusy now to do it all in a oner.
The answer i should have given you was-
Rome wasnt built in a day !!!!
The enjoyment isnt getting to 300, 400, 500 in one go. the enjoyment is the whole process to getting there..
Once you get to a certain level, the fun stops and you get bored again