Since tons of NB builds out there and for some unknown reason no BD builds I will post mine.
Basically I perfer this over the nb/sin/rng build for 1 simple reason, 5% hit chance means I can stack crit and still not miss. I have about 43% crit with dauntless strike running and beat everyone besides beastmasters in single target dps, and i mean everyone (including nightblades). To put it simply, bladedancer abilities hit MUCH harder than assasssin and nightblade abilities and there are way less of them with 0 dots in the rotation making a very simple rotation for high dps.
I literally have 1 macro and then have my finishers on my bar. Macro looks like this
#show Weapon Barrage (this allows me to see when it is off cooldown)
cast Precision Strike
cast Quick Strike
cast Keen Strike
cast Weapon Barrage (you have to spam it when on gcd for it to go off, allows you to maximize dps or hold on to it for an interrupt)
cast Blade Tempo (easy to not activate if you dont want, but more dps if you do asap)
cast Double Coup (chains right after blade tempo for max burst)
That is my only macro, you also want to use dancing steel right after blade tempo, and use Lethal poison and Hellfire blades.
A max dps rotation will start expose weakness -> dark malady -> blade tempo -> dancing steel for 50% bonus dmg to it which is insane, then spam 1 till 5 cps then finishers (dauntless if no bard)
This build pulls high threat so be careful, I have Side Steps hotkeyed so when I get aggro i can mash it asap!
Basically this build requires 17 in sin 12 in nb and 32 in bd leaving you with 5 leftover points to do with as you choose, I put 1 in bd and 4 in sin for perma stealth, improved stealth and blind, 3 things I find very useful in experts AND world pvp, you have no idea how many times blind has saved me in both and improved stealth with perma stealth is mandatory if you wish to CC or world pvp at all.
for world pvp this build gives you a disarm, charge/root, 50% snare that lasts for a very long time, and tons of burst dmg from stealth if done right.
For a reference point on dps since i have no parses ready. Fully buffed I do about 600 ranged dps as a saboteur (cookie cutter build, prob more if I went ranger or whatever for ranged auto attacks). This build stays in the 700-800ish range depending on movement and much higher for trash, topping around 2900 when dancing steel is up on aoe pulls.
I've only tested this build in t1s and t2s so dunno what it will do in a raid situation, but this build beats nb for me and allows better itemization so you dont need that crappy hit gear which lowers your dps tremendously! also the rotation is warrior-esque (ie 2 buttons) and doesnt require the use of any dots whatsoever, though puncture may increase dps some i have no idea, quick strike seems to do a TON of dmg and is nearly spammable...
On a side note, I stack crit, I do not have a single piece of gear on me with AP, every last piece is dex/crit or dex/hit, to achieve this I have to mix-match blues... note the 43% self-buffed crit. I also never run out of energy with a bard/chloro, I can simply spam abilities every gcd for the duration of a fight!