I actually have 3 armies, a Tyranid army which I was my first army and still building on, although I keep scrapping my older models as my new painting styles surpass my old cappy ways and I don't like having a mix of old crappy looking models and new coo looking ones.
My Tyranid army currently doesn't hae much (due to the afore mentioned model removing) but it does have a Hierophant!!!!! That T9 / W10 beast can take on 20 Marine Terminators and win!!! But then again you would expect that from something that costs 1,250 pts to use.
My second army is a Chaos Iron warriors army. However, I have "paused" this army and so wont be building it up at the moment....that is if I come back to this at all.
My Ork army has only started up, I currently have A Warbos, 5 Nobz, a lotted Rhino tank, 2 DeffKoptas and 2 Boyz fully painted but I have another 50 odd boyz to paint.