Hi,
do both,
buy another box of boyz and build both lottas and burnas you have enopught parts and than some
to build extra nobz, tankbustas and so on.
I also build my commandoes out of burna bitz and boyz.
Just take a boy and the burna head and backback, together with a pistokl and tankbusta bomb an ther you go.
Nothing is more fund than building and converting Orcs, nothing is more long and tideous than painting them all afterwards.
For my Orc painting its' 15 done 300 to go ....
Thanks
Marko