I'm very much still in the early stages i think! I hadn't considered any of the points you all mentioned! I think i will run it as is without pushing too much through it, in all honesty by the time i start seriously gigging i may be able to afford a better rig anyway, so i'll leave it and play through it, just clean it up, re castor it, re cover it etc so i can sell it on next year. No point plowing £200 into new drivers, like you said thats half a new cab anyway!
Thanks again to all for waking me up to a few points and i'll see how it runs