You don't need two weapons (and it looks like you have better options than either of the ones you list- if I were you I'd go with the Wraith, Talon, Graal, Raider, Claymore, or Piranha). You can't spec out of Shockwave. Have to take 4b on Warp. Find a better gear bonus if possible- Geth Scanner is sort of ideal.
With 4b on Warp, and 5a on Shockwave, he has the most powerful biotic explosions in the game- they nearly one-shot Banshee barriers on Gold/Platinum. He's also one of the most durable kits in the game (he's the only kit I've ever managed to get 10 Waves Survived on a Platinum solo with). Here's an alternative build to the one you gave which I would recommend-
http://kalence.drupa...25!!..N2!5GD5GO
I think you'll find this build incredibly durable/survivable (even without a Cyclonic- add a Cyclonic III and he's virtually invincible on Gold), and with his powerful BE's and Krogan awesome-ness he can bring the pain as well.
(either Warp or Incendiary ammo works wonders on him- hit an enemy with Warp before you shoot and you get a gigantic damage boost from the Warp Ammo's biotic damage bonus and Warp 5b 15% debuff.. whereas Incendiary ammo has a glitched interaction with Warp that ends up doing more damage than its supposed to)