You mean as in builds? I'm fairily certain these builds are no secret. Heck one of the great things about DT is that you can constantly play with your build and tweak it to suit your playstyle.
As far as trying tali spec: Do it if you have the gear! Yes you will fail at first because it IS different, it takes some getting used to. You are far more dependent on dps which means you better not stop if you're getting hit. The other tanks just need to learn how to deal with it. A quick FE or goad is often all you need to regen your hp when you get low.
A single DT running this kind of spec can be a bit painful, where it gets really fun is if you have several than can trade aggro.
I strongly suggest running ACT when you start doing this, you have to start getting a feel for what kinds of numbers you need to be outputting to offset the dmg you're taking.
You don't have all your regular aggro tools anymore (no SoC, no dread to save your bacon), dps is your aggro & your suvivability.
Switch out accessories during a fight and see how it affects your dps & survivability.
Play with your stances.
Don't get discouraged if you fail.
Oh and get yourself a suicide suit (light armor w/ magic) and have some fun
I know I am by no means "the measure of things", there are pleny of DTs better than I, but if you're on the Set server and you catch me online I'll be more than happy share what I know.