Who the hell wants to run 3-5 man platoons? I sure as hell don't. They are pointless. I will actually be trying out the Blade Assault Company with 4 chimeras and a hellhound, actually went out and bought one today. Need to figure out which variant I want to make or does it HAVE to be a hellhound, as written?
if you want to go for a flamer template with ignore cover, go for the Chem cannon (poisoned 2+ is awesome against marines and such)
however the Melta cannon lets you shoot a small blast with melta stats, minus the melta special rule.
between these two the standard hellhound seems a bit. sad.
and personaly I got great delight out of killing a ravenwing bike squad with the chem cannon last weekend.