Went for this package from transwave on ebay. It's about the same price as the newton tesla kit but it has a "better inverter" in the sense that it can be cnc controlled whereas the standard package from newton tesla didn't have this ability.
http://www.ebay.co.uk/itm/1hp-IMO-Ja.../161503539660?
Lets hope it arrives over christmas whilst i have time off to play..