A TWF rogue could probably out DPS you given equal sneak attack opportunites, but its not a bad build by any streach. I have a rogue which was built for THF originaly but in the end TWF just turned out to be much more powerfull for him.
I also would skip SF DD, and possible the dragonmark but the rest of it is decent. You don't really have good agro control but you can handle a bit of agro and should do decent damage even when you get agro.
I find all the extreem gear and tomes and such tends to kind of obscure the foundation of a build which is what builds are about really.