DE have a tactical ability called webway assault where you get to deepstrike 3 webway portals, that units can enter play from, and move in and out of (can move from one webway portal to another) that I think would be a bit better than flank-march. I would take 2 or 3 titan hunter squads, and theres the splinter raid force where you get to deepstrike in a bunch of kabalite warriors in raiders, and RJBs.
If you wanted to go another route and have the money and models, theres also the karnival of pain where you get to take urien, and a bunch of grots and wracks and give them combat drugs, each grot or wrack squad within 12" of urien at the beginning of the turn gets a second combat drug... XD
Karnival of Pain + dual webway assaults would be full of win... toss a haemun in with each squad and they all start off with FNP and FC, and Uriens master of pain ability could give D3 grot squads fearless as well... looking at a rather scary force... combine that with the fact that they could move from portal to portal (and 6 portals on the board)...
then a few titan hunter squads, just in case there are any super-heavies... XD