I'm not sure about your experience with the combine but i find them super lackluster.
Rest of the list looks solid though, bloodgorgers are silly awesome (and very hard to prepare for when going against cryx.)
Pistols wraiths are a nice annoyance for people. Perhaps throw two of them in instead of the combine?
... Also i have 2 for you
Just need to send!
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)