I don't have 1 collection specifically. What I do have is a lot of smaller 1000 to 1500 armies, because I have friends that I buy for.
that being said I guess, combined order what with my friends wanting to play the lizar- I mean seraphon, sylvaneth, stormcasts and all being under order I guess I have a 3000 pointish general order.
I much prefer chaos myself so what we will do is have games where it's five on 1 with me having a bunch of khorne bloodbound and skaven working together to make one big super army.
my undead army is really fun to fight too seeing as I have a bunch of different old fantasy units with it because I played old fantasy.