Hi
I recommend 2SC5707. For specific DC-DC inverter transistor.
CCFL inverters are used. Try a search on Google.(CCFL inverters 2SC5707-Royer converter)
I CCFL inverter, to solve the ignition power.
I rewound to the transformer (EE19 ferrite core).
Primary coil not replace.
Secondary coil replace : 100 turns (0.25 copper wire).
I tell you, Royer, push pull inverter is more suitable.
Project is not over yet.
More on that later.
Link:www.mikrocontroller.net/wikifiles/f/f3/Royer_Converter.xls
Link:www.mikrocontroller.net/articles/Royer_Converter