The problem with the poll is unfortunately you can only vote once, and a lot of us (most I would guess) collect multiple armies.
So: Orks, 2 BA armies (one loyalist, one renegade), Ultramarines and Imperial Fists, Eldar, nids, and just started Witch-hunters, to give my few IG something to do. Also got a few necrons and DE lying around somewhere, and a couple of Space Wolves. I don't consider that I'm 'collecting' those though, except by accident. I think that's it.
Of those, the renegade BA, Orks and Ultramarines are all more than 1500pts (Orks and Ultramarines, more than 3000pts, but I haven't totted them up lately, I just pick and choose from the units I have).