I have to say i've tried the RF build and it doesn't hold a match to the Ninja build.
Hiya Wolf! Been a while since we've done a run together so I haven't seen your ninja build in action.
However I wanted to say that you can't just "try the RF build". You have to gear around it otherwise it won't really be optimal.
I am running Nyan's swap build and I have to say I haven't seen a non-RF DH come close to the dmg output/kill efficiency. I think the last time we ran together you were using BL and Spike Trap, which was ok but it was not melting the mobs down.
With ~100 mill worth of gear (yes just 100 mill) I kill Ghom in about 45 secs with Bombardment (AE attack) which breaks down to about 2.8 mill edps. At this rate, I kill MP10 zombies at about 2-3 secs in an 16 yard diameter. With a Cyclone monk, this is pretty darn good.
Also since I am using Nyan's swap build, I have 630k eHP + LL from Gloom so I almost never die. AND I get to use Legacy Nats so I can prep-punishment very often to keep RF going.
In "good" crypt games, I find that staying back and firing from a distance doesn't do any good since clusters die within a few seconds (pull monk + bats) so I end up vaulting into the middle of packs, popping SS and then start my RF killing spree. In a way I'm similar to a Firebats build since I center myself around packs, but I have the flexibility of redirecting my center of damage.
One last thing, again I am only working with roughly 100M worth of gear. I know Nyan has some money invested in his and it shows. I've seen a video where he killed Ghom in 9 secs which translates to about 14.4 mill edps. That was single target RF but I'm sure if he swapped to bombardment it wouldn't be decreased by that much. At that DPS, crypts would just be a joke.
Here is my gear:
Dmg, no cc - http://d3up.com/b/1265420/willythekid-dmg-no-cc
Tank / cc - http://d3up.com/b/1265247/willythekid-cc-tank-build
I've changed a few things since then but not much.