I would suggest elemental as the stormshroud armor is pretty sweet, and tribal only has the 2 devilsaur patterns that are particularly usefull to us rogues. Dragon is all mail so its pretty much worthless to rogues except for selling it for gold.
Frankly though, I'd also suggest taking a closer look at mining and engineering since mining makes the mad cash and engineering makes some pretty neat gizmos that come in handy for rogues. (hurray explosives!)
I'm 300 tribal LW and I really wish I'd went the mining/engineering way... But I feel guilty ditching a lvl300 craft. ><
As for helping ALL rogues, you'll ALWAYS have competition in any profession, but by going engineering, you can help those rogues out in a way they've pbbly never been helped before... By giving them some EZ-thro dynamite II! Trust me, they'll enjoy it. lol ~Pye