the hard core zealots sound awesome.
what i would do to start would be...get the battleforce!
its your basic force. a russ, 20 guardsmen, and 3 weapons teams. the terrain in there is useless though
the macharius vanquisher is much better then the baneblade IMO
sure the mega battle cannon is nice but still, its overused and i just like using the differant stuff. maybe some manticore launchers....