With the fall of the GW GT's I'm pretty sure things will go the way of popular GT's/Adepticon. So I think 1850 will be getting more and more popular. Most people are already building for it.
I wouldn't be surprised if 2500 is also popular as it is the points for 'Ard Boyz which is now the only GW tournament in the U.S.
Dark Angels 1750 win/loss Record
Win - 23 (Belial helped wreck Ryan's puny Eldar)
Loss - 13 (Brice's Necrons wiped me)
Draw - 2 (The 13th hold out in alpha take and hold)