Ahh I build for 2000pts. I have a list with 2 demi and a support squadron. Lots of guns. A 2k double demi doesn't have a lot of room anyway for more then say, a rwss, or rwas, or hammer of caliban. All good support for greenwing. All the other fun formations are spendy anyway...
A double demi supports my play style...tons of marines with support. But I also love DW. Too bad I can't fit both into a 2k lion's