Welcome to the forum Ben. 
You would be correct to pick the edition 30 for the tuning potential.
Its hard to nail down actual figures for the various stages.
But a basic map should give you between 270 and 280
add a turbo back zorst to this and you can add another 10 to 20
a Stage 2 map with zorst will see you well over 300. one of our members on here Greenouse has achieved 325 i think on some very conservative roller's
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after this basic stuff you need to read Jonny C's build thread to capture what is left in a KO 4 he is up around 340 to 360.
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