[Gordo]

Red line on mine is 7k - whilst I don't know how accurate (?) that is, the limiter cuts in exactly on the line.
Before you go too far, I'd recommend using no more that 7k until you can check the accuraccy of the tacho' (any instrument specialist will be able to check and, if required, recalibrate it for you AND you know exactly what the internal spec of the engine is.
Then you'll have an idea of what the engine can actually be turned to with a good expectation of reliability.

 

[Gordo]

Regarding these comments
"if it doesnt make anymore power after 6.5k then like you've said, theres no need to rev the arse off it and potential wear components out quicker."
and
"second that^^^ you lose power after 6250-6500, so acutally your just wearing down components for no reason. hence limiting the engine life.
unless you have your car chipped, raising the rev there is no point bouncing your rev pointer"

Seems you don't understand why a shift point will ALWAYS be above peak power unless that corresponds to maximum rpm for the engine which would suggest the customer or builder cocked up the specification.
The shift point should be where the power/torque at the wheels in any gear drops to the same power in the next, higher, gear - what you are looking for is the maximum AVERAGE power. Where the shift point is for any engine/transmission combination will vary - usually even between the different gears.
However, as most engines, especially those not using racing boxes, run out of rpm before the above point is reached, changing at the red line is normally the best option.